diff --git a/eng/common/core-templates/job/source-build.yml b/eng/common/core-templates/job/source-build.yml
index d805d5faeb9..4f45cce0f3f 100644
--- a/eng/common/core-templates/job/source-build.yml
+++ b/eng/common/core-templates/job/source-build.yml
@@ -63,7 +63,7 @@ jobs:
           demands: ImageOverride -equals build.ubuntu.2004.amd64
         ${{ if eq(variables['System.TeamProject'], 'internal') }}:
           name: $[replace(replace(eq(contains(coalesce(variables['System.PullRequest.TargetBranch'], variables['Build.SourceBranch'], 'refs/heads/main'), 'release'), 'true'), True, 'NetCore1ESPool-Svc-Internal'), False, 'NetCore1ESPool-Internal')]
-          image: 1es-mariner-2
+          image: 1es-azurelinux-3
           os: linux
     ${{ else }}:
       pool:
diff --git a/src/EFCore/Query/Internal/ExpressionTreeFuncletizer.cs b/src/EFCore/Query/Internal/ExpressionTreeFuncletizer.cs
index 656ac41eee5..976d4b8d57f 100644
--- a/src/EFCore/Query/Internal/ExpressionTreeFuncletizer.cs
+++ b/src/EFCore/Query/Internal/ExpressionTreeFuncletizer.cs
@@ -995,20 +995,23 @@ protected override Expression VisitMethodCall(MethodCallExpression methodCall)
 
             static bool TryUnwrapSpanImplicitCast(Expression expression, [NotNullWhen(true)] out Expression? result)
             {
-                if (expression is MethodCallExpression
+                switch (expression)
+                {
+                    case MethodCallExpression
                     {
                         Method: { Name: "op_Implicit", DeclaringType: { IsGenericType: true } implicitCastDeclaringType },
                         Arguments: [var unwrapped]
+                    } when implicitCastDeclaringType.GetGenericTypeDefinition() is var genericTypeDefinition
+                        && (genericTypeDefinition == typeof(Span<>) || genericTypeDefinition == typeof(ReadOnlySpan<>)):
+                    {
+                        result = unwrapped;
+                        return true;
                     }
-                    && implicitCastDeclaringType.GetGenericTypeDefinition() is var genericTypeDefinition
-                    && (genericTypeDefinition == typeof(Span<>) || genericTypeDefinition == typeof(ReadOnlySpan<>)))
-                {
-                    result = unwrapped;
-                    return true;
-                }
 
-                result = null;
-                return false;
+                    default:
+                        result = null;
+                        return false;
+                }
             }
         }
 
diff --git a/test/EFCore.Cosmos.FunctionalTests/Query/PrimitiveCollectionsQueryCosmosTest.cs b/test/EFCore.Cosmos.FunctionalTests/Query/PrimitiveCollectionsQueryCosmosTest.cs
index 71cb9e15f11..127a7f2568a 100644
--- a/test/EFCore.Cosmos.FunctionalTests/Query/PrimitiveCollectionsQueryCosmosTest.cs
+++ b/test/EFCore.Cosmos.FunctionalTests/Query/PrimitiveCollectionsQueryCosmosTest.cs
@@ -1986,6 +1986,42 @@ await Assert.ThrowsAsync<InvalidOperationException>(
         AssertSql();
     }
 
+    public override async Task Contains_on_Enumerable()
+    {
+        await base.Contains_on_Enumerable();
+
+        AssertSql(
+            """
+SELECT VALUE c
+FROM root c
+WHERE c["Int"] IN (10, 999)
+""");
+    }
+
+    public override async Task Contains_on_MemoryExtensions()
+    {
+        await base.Contains_on_MemoryExtensions();
+
+        AssertSql(
+            """
+SELECT VALUE c
+FROM root c
+WHERE c["Int"] IN (10, 999)
+""");
+    }
+
+    public override async Task Contains_with_MemoryExtensions_with_null_comparer()
+    {
+        await base.Contains_with_MemoryExtensions_with_null_comparer();
+
+        AssertSql(
+            """
+SELECT VALUE c
+FROM root c
+WHERE c["Int"] IN (10, 999)
+""");
+    }
+
     [ConditionalFact]
     public virtual void Check_all_tests_overridden()
         => TestHelpers.AssertAllMethodsOverridden(GetType());
diff --git a/test/EFCore.Specification.Tests/Query/PrimitiveCollectionsQueryTestBase.cs b/test/EFCore.Specification.Tests/Query/PrimitiveCollectionsQueryTestBase.cs
index 1f916cda53d..229ca5fbda1 100644
--- a/test/EFCore.Specification.Tests/Query/PrimitiveCollectionsQueryTestBase.cs
+++ b/test/EFCore.Specification.Tests/Query/PrimitiveCollectionsQueryTestBase.cs
@@ -573,6 +573,28 @@ public virtual Task Column_collection_of_nullable_strings_contains_null()
     public virtual Task Column_collection_of_bools_Contains()
         => AssertQuery(ss => ss.Set<PrimitiveCollectionsEntity>().Where(c => c.Bools.Contains(true)));
 
+    // C# 14 first-class spans caused MemoryExtensions.Contains to get resolved instead of Enumerable.Contains.
+    // The following tests that the various overloads are all supported.
+    [ConditionalFact]
+    [MemberData(nameof(IsAsyncData))]
+    public virtual Task Contains_on_Enumerable()
+        => AssertQuery(
+            ss => ss.Set<PrimitiveCollectionsEntity>().Where(c => Enumerable.Contains(new[] { 10, 999 }, c.Int)));
+
+    // C# 14 first-class spans caused MemoryExtensions.Contains to get resolved instead of Enumerable.Contains.
+    // The following tests that the various overloads are all supported.
+    [ConditionalFact]
+    [MemberData(nameof(IsAsyncData))]
+    public virtual Task Contains_on_MemoryExtensions()
+        => AssertQuery(
+            ss => ss.Set<PrimitiveCollectionsEntity>().Where(c => MemoryExtensions.Contains(new[] { 10, 999 }, c.Int)));
+
+    [ConditionalFact]
+    [MemberData(nameof(IsAsyncData))]
+    public virtual Task Contains_with_MemoryExtensions_with_null_comparer()
+        => AssertQuery(
+            ss => ss.Set<PrimitiveCollectionsEntity>().Where(c => MemoryExtensions.Contains(new[] { 10, 999 }, c.Int, comparer: null)));
+
     [ConditionalFact]
     public virtual Task Column_collection_Count_method()
         => AssertQuery(
diff --git a/test/EFCore.SqlServer.FunctionalTests/Query/PrimitiveCollectionsQueryOldSqlServerTest.cs b/test/EFCore.SqlServer.FunctionalTests/Query/PrimitiveCollectionsQueryOldSqlServerTest.cs
index 3e96e03ff95..4b60503d2c9 100644
--- a/test/EFCore.SqlServer.FunctionalTests/Query/PrimitiveCollectionsQueryOldSqlServerTest.cs
+++ b/test/EFCore.SqlServer.FunctionalTests/Query/PrimitiveCollectionsQueryOldSqlServerTest.cs
@@ -884,6 +884,43 @@ await context.Database.SqlQuery<string>($"SELECT [Bools] AS [Value] FROM [Primit
                 .SingleAsync());
     }
 
+    public override async Task Contains_on_Enumerable()
+    {
+        await base.Contains_on_Enumerable();
+
+        AssertSql(
+            """
+SELECT [p].[Id], [p].[Bool], [p].[Bools], [p].[DateTime], [p].[DateTimes], [p].[Enum], [p].[Enums], [p].[Int], [p].[Ints], [p].[NullableInt], [p].[NullableInts], [p].[NullableString], [p].[NullableStrings], [p].[NullableWrappedId], [p].[NullableWrappedIdWithNullableComparer], [p].[String], [p].[Strings], [p].[WrappedId]
+FROM [PrimitiveCollectionsEntity] AS [p]
+WHERE [p].[Int] IN (10, 999)
+""");
+    }
+
+
+    public override async Task Contains_on_MemoryExtensions()
+    {
+        await base.Contains_on_MemoryExtensions();
+
+        AssertSql(
+            """
+SELECT [p].[Id], [p].[Bool], [p].[Bools], [p].[DateTime], [p].[DateTimes], [p].[Enum], [p].[Enums], [p].[Int], [p].[Ints], [p].[NullableInt], [p].[NullableInts], [p].[NullableString], [p].[NullableStrings], [p].[NullableWrappedId], [p].[NullableWrappedIdWithNullableComparer], [p].[String], [p].[Strings], [p].[WrappedId]
+FROM [PrimitiveCollectionsEntity] AS [p]
+WHERE [p].[Int] IN (10, 999)
+""");
+    }
+
+    public override async Task Contains_with_MemoryExtensions_with_null_comparer()
+    {
+        await base.Contains_with_MemoryExtensions_with_null_comparer();
+
+        AssertSql(
+            """
+SELECT [p].[Id], [p].[Bool], [p].[Bools], [p].[DateTime], [p].[DateTimes], [p].[Enum], [p].[Enums], [p].[Int], [p].[Ints], [p].[NullableInt], [p].[NullableInts], [p].[NullableString], [p].[NullableStrings], [p].[NullableWrappedId], [p].[NullableWrappedIdWithNullableComparer], [p].[String], [p].[Strings], [p].[WrappedId]
+FROM [PrimitiveCollectionsEntity] AS [p]
+WHERE [p].[Int] IN (10, 999)
+""");
+    }
+
     public override Task Column_collection_Count_method()
         => AssertCompatibilityLevelTooLow(() => base.Column_collection_Count_method());
 
diff --git a/test/EFCore.SqlServer.FunctionalTests/Query/PrimitiveCollectionsQuerySqlServer160Test.cs b/test/EFCore.SqlServer.FunctionalTests/Query/PrimitiveCollectionsQuerySqlServer160Test.cs
index cd315934d3e..0e815ebdcb4 100644
--- a/test/EFCore.SqlServer.FunctionalTests/Query/PrimitiveCollectionsQuerySqlServer160Test.cs
+++ b/test/EFCore.SqlServer.FunctionalTests/Query/PrimitiveCollectionsQuerySqlServer160Test.cs
@@ -961,6 +961,43 @@ await context.Database.SqlQuery<string>($"SELECT [Bools] AS [Value] FROM [Primit
                 .SingleAsync());
     }
 
+    public override async Task Contains_on_Enumerable()
+    {
+        await base.Contains_on_Enumerable();
+
+        AssertSql(
+            """
+SELECT [p].[Id], [p].[Bool], [p].[Bools], [p].[DateTime], [p].[DateTimes], [p].[Enum], [p].[Enums], [p].[Int], [p].[Ints], [p].[NullableInt], [p].[NullableInts], [p].[NullableString], [p].[NullableStrings], [p].[NullableWrappedId], [p].[NullableWrappedIdWithNullableComparer], [p].[String], [p].[Strings], [p].[WrappedId]
+FROM [PrimitiveCollectionsEntity] AS [p]
+WHERE [p].[Int] IN (10, 999)
+""");
+    }
+
+
+    public override async Task Contains_on_MemoryExtensions()
+    {
+        await base.Contains_on_MemoryExtensions();
+
+        AssertSql(
+            """
+SELECT [p].[Id], [p].[Bool], [p].[Bools], [p].[DateTime], [p].[DateTimes], [p].[Enum], [p].[Enums], [p].[Int], [p].[Ints], [p].[NullableInt], [p].[NullableInts], [p].[NullableString], [p].[NullableStrings], [p].[NullableWrappedId], [p].[NullableWrappedIdWithNullableComparer], [p].[String], [p].[Strings], [p].[WrappedId]
+FROM [PrimitiveCollectionsEntity] AS [p]
+WHERE [p].[Int] IN (10, 999)
+""");
+    }
+
+    public override async Task Contains_with_MemoryExtensions_with_null_comparer()
+    {
+        await base.Contains_with_MemoryExtensions_with_null_comparer();
+
+        AssertSql(
+            """
+SELECT [p].[Id], [p].[Bool], [p].[Bools], [p].[DateTime], [p].[DateTimes], [p].[Enum], [p].[Enums], [p].[Int], [p].[Ints], [p].[NullableInt], [p].[NullableInts], [p].[NullableString], [p].[NullableStrings], [p].[NullableWrappedId], [p].[NullableWrappedIdWithNullableComparer], [p].[String], [p].[Strings], [p].[WrappedId]
+FROM [PrimitiveCollectionsEntity] AS [p]
+WHERE [p].[Int] IN (10, 999)
+""");
+    }
+
     public override async Task Column_collection_Count_method()
     {
         await base.Column_collection_Count_method();
diff --git a/test/EFCore.SqlServer.FunctionalTests/Query/PrimitiveCollectionsQuerySqlServerJsonTypeTest.cs b/test/EFCore.SqlServer.FunctionalTests/Query/PrimitiveCollectionsQuerySqlServerJsonTypeTest.cs
index 90dd2b8c5ab..dba48fa2a34 100644
--- a/test/EFCore.SqlServer.FunctionalTests/Query/PrimitiveCollectionsQuerySqlServerJsonTypeTest.cs
+++ b/test/EFCore.SqlServer.FunctionalTests/Query/PrimitiveCollectionsQuerySqlServerJsonTypeTest.cs
@@ -1108,6 +1108,43 @@ await context.Database.SqlQuery<string>($"SELECT [Bools] AS [Value] FROM [Primit
                 .SingleAsync());
     }
 
+    public override async Task Contains_on_Enumerable()
+    {
+        await base.Contains_on_Enumerable();
+
+        AssertSql(
+            """
+SELECT [p].[Id], [p].[Bool], [p].[Bools], [p].[DateTime], [p].[DateTimes], [p].[Enum], [p].[Enums], [p].[Int], [p].[Ints], [p].[NullableInt], [p].[NullableInts], [p].[NullableString], [p].[NullableStrings], [p].[NullableWrappedId], [p].[NullableWrappedIdWithNullableComparer], [p].[String], [p].[Strings], [p].[WrappedId]
+FROM [PrimitiveCollectionsEntity] AS [p]
+WHERE [p].[Int] IN (10, 999)
+""");
+    }
+
+
+    public override async Task Contains_on_MemoryExtensions()
+    {
+        await base.Contains_on_MemoryExtensions();
+
+        AssertSql(
+            """
+SELECT [p].[Id], [p].[Bool], [p].[Bools], [p].[DateTime], [p].[DateTimes], [p].[Enum], [p].[Enums], [p].[Int], [p].[Ints], [p].[NullableInt], [p].[NullableInts], [p].[NullableString], [p].[NullableStrings], [p].[NullableWrappedId], [p].[NullableWrappedIdWithNullableComparer], [p].[String], [p].[Strings], [p].[WrappedId]
+FROM [PrimitiveCollectionsEntity] AS [p]
+WHERE [p].[Int] IN (10, 999)
+""");
+    }
+
+    public override async Task Contains_with_MemoryExtensions_with_null_comparer()
+    {
+        await base.Contains_with_MemoryExtensions_with_null_comparer();
+
+        AssertSql(
+            """
+SELECT [p].[Id], [p].[Bool], [p].[Bools], [p].[DateTime], [p].[DateTimes], [p].[Enum], [p].[Enums], [p].[Int], [p].[Ints], [p].[NullableInt], [p].[NullableInts], [p].[NullableString], [p].[NullableStrings], [p].[NullableWrappedId], [p].[NullableWrappedIdWithNullableComparer], [p].[String], [p].[Strings], [p].[WrappedId]
+FROM [PrimitiveCollectionsEntity] AS [p]
+WHERE [p].[Int] IN (10, 999)
+""");
+    }
+
     public override async Task Column_collection_Count_method()
     {
         await base.Column_collection_Count_method();
@@ -1685,8 +1722,8 @@ public override async Task Parameter_collection_Concat_column_collection()
 
         AssertSql(
             """
-@ints1='11'
-@ints2='111'
+@p1='11'
+@p2='111'
 
 SELECT [p].[Id], [p].[Bool], [p].[Bools], [p].[DateTime], [p].[DateTimes], [p].[Enum], [p].[Enums], [p].[Int], [p].[Ints], [p].[NullableInt], [p].[NullableInts], [p].[NullableString], [p].[NullableStrings], [p].[NullableWrappedId], [p].[NullableWrappedIdWithNullableComparer], [p].[String], [p].[Strings], [p].[WrappedId]
 FROM [PrimitiveCollectionsEntity] AS [p]
@@ -1694,10 +1731,10 @@ FROM [PrimitiveCollectionsEntity] AS [p]
     SELECT COUNT(*)
     FROM (
         SELECT 1 AS empty
-        FROM (VALUES (@ints1), (@ints2)) AS [i]([Value])
+        FROM (VALUES (@p1), (@p2)) AS [p0]([Value])
         UNION ALL
         SELECT 1 AS empty
-        FROM OPENJSON([p].[Ints]) AS [i0]
+        FROM OPENJSON([p].[Ints]) AS [i]
     ) AS [u]) = 2
 """);
     }
diff --git a/test/EFCore.SqlServer.FunctionalTests/Query/PrimitiveCollectionsQuerySqlServerTest.cs b/test/EFCore.SqlServer.FunctionalTests/Query/PrimitiveCollectionsQuerySqlServerTest.cs
index c09b7f34410..5082de36803 100644
--- a/test/EFCore.SqlServer.FunctionalTests/Query/PrimitiveCollectionsQuerySqlServerTest.cs
+++ b/test/EFCore.SqlServer.FunctionalTests/Query/PrimitiveCollectionsQuerySqlServerTest.cs
@@ -984,6 +984,42 @@ await context.Database.SqlQuery<string>($"SELECT [Bools] AS [Value] FROM [Primit
                 .SingleAsync());
     }
 
+    public override async Task Contains_on_Enumerable()
+    {
+        await base.Contains_on_Enumerable();
+
+        AssertSql(
+            """
+SELECT [p].[Id], [p].[Bool], [p].[Bools], [p].[DateTime], [p].[DateTimes], [p].[Enum], [p].[Enums], [p].[Int], [p].[Ints], [p].[NullableInt], [p].[NullableInts], [p].[NullableString], [p].[NullableStrings], [p].[NullableWrappedId], [p].[NullableWrappedIdWithNullableComparer], [p].[String], [p].[Strings], [p].[WrappedId]
+FROM [PrimitiveCollectionsEntity] AS [p]
+WHERE [p].[Int] IN (10, 999)
+""");
+    }
+
+    public override async Task Contains_on_MemoryExtensions()
+    {
+        await base.Contains_on_MemoryExtensions();
+
+        AssertSql(
+            """
+SELECT [p].[Id], [p].[Bool], [p].[Bools], [p].[DateTime], [p].[DateTimes], [p].[Enum], [p].[Enums], [p].[Int], [p].[Ints], [p].[NullableInt], [p].[NullableInts], [p].[NullableString], [p].[NullableStrings], [p].[NullableWrappedId], [p].[NullableWrappedIdWithNullableComparer], [p].[String], [p].[Strings], [p].[WrappedId]
+FROM [PrimitiveCollectionsEntity] AS [p]
+WHERE [p].[Int] IN (10, 999)
+""");
+    }
+
+    public override async Task Contains_with_MemoryExtensions_with_null_comparer()
+    {
+        await base.Contains_with_MemoryExtensions_with_null_comparer();
+
+        AssertSql(
+            """
+SELECT [p].[Id], [p].[Bool], [p].[Bools], [p].[DateTime], [p].[DateTimes], [p].[Enum], [p].[Enums], [p].[Int], [p].[Ints], [p].[NullableInt], [p].[NullableInts], [p].[NullableString], [p].[NullableStrings], [p].[NullableWrappedId], [p].[NullableWrappedIdWithNullableComparer], [p].[String], [p].[Strings], [p].[WrappedId]
+FROM [PrimitiveCollectionsEntity] AS [p]
+WHERE [p].[Int] IN (10, 999)
+""");
+    }
+
     public override async Task Column_collection_Count_method()
     {
         await base.Column_collection_Count_method();
diff --git a/test/EFCore.Sqlite.FunctionalTests/Query/PrimitiveCollectionsQuerySqliteTest.cs b/test/EFCore.Sqlite.FunctionalTests/Query/PrimitiveCollectionsQuerySqliteTest.cs
index 615e1eb3070..f6098426ccb 100644
--- a/test/EFCore.Sqlite.FunctionalTests/Query/PrimitiveCollectionsQuerySqliteTest.cs
+++ b/test/EFCore.Sqlite.FunctionalTests/Query/PrimitiveCollectionsQuerySqliteTest.cs
@@ -954,6 +954,43 @@ FROM json_each("p"."Bools") AS "b"
 """);
     }
 
+    public override async Task Contains_on_Enumerable()
+    {
+        await base.Contains_on_Enumerable();
+
+        AssertSql(
+            """
+SELECT "p"."Id", "p"."Bool", "p"."Bools", "p"."DateTime", "p"."DateTimes", "p"."Enum", "p"."Enums", "p"."Int", "p"."Ints", "p"."NullableInt", "p"."NullableInts", "p"."NullableString", "p"."NullableStrings", "p"."NullableWrappedId", "p"."NullableWrappedIdWithNullableComparer", "p"."String", "p"."Strings", "p"."WrappedId"
+FROM "PrimitiveCollectionsEntity" AS "p"
+WHERE "p"."Int" IN (10, 999)
+""");
+    }
+
+
+    public override async Task Contains_on_MemoryExtensions()
+    {
+        await base.Contains_on_MemoryExtensions();
+
+        AssertSql(
+            """
+SELECT "p"."Id", "p"."Bool", "p"."Bools", "p"."DateTime", "p"."DateTimes", "p"."Enum", "p"."Enums", "p"."Int", "p"."Ints", "p"."NullableInt", "p"."NullableInts", "p"."NullableString", "p"."NullableStrings", "p"."NullableWrappedId", "p"."NullableWrappedIdWithNullableComparer", "p"."String", "p"."Strings", "p"."WrappedId"
+FROM "PrimitiveCollectionsEntity" AS "p"
+WHERE "p"."Int" IN (10, 999)
+""");
+    }
+
+    public override async Task Contains_with_MemoryExtensions_with_null_comparer()
+    {
+        await base.Contains_with_MemoryExtensions_with_null_comparer();
+
+        AssertSql(
+            """
+SELECT "p"."Id", "p"."Bool", "p"."Bools", "p"."DateTime", "p"."DateTimes", "p"."Enum", "p"."Enums", "p"."Int", "p"."Ints", "p"."NullableInt", "p"."NullableInts", "p"."NullableString", "p"."NullableStrings", "p"."NullableWrappedId", "p"."NullableWrappedIdWithNullableComparer", "p"."String", "p"."Strings", "p"."WrappedId"
+FROM "PrimitiveCollectionsEntity" AS "p"
+WHERE "p"."Int" IN (10, 999)
+""");
+    }
+
     public override async Task Column_collection_Count_method()
     {
         await base.Column_collection_Count_method();