diff --git a/src/Mono.Android/Java.Interop/JavaObjectExtensions.cs b/src/Mono.Android/Java.Interop/JavaObjectExtensions.cs
index 345c664c61d..a3e817facb9 100644
--- a/src/Mono.Android/Java.Interop/JavaObjectExtensions.cs
+++ b/src/Mono.Android/Java.Interop/JavaObjectExtensions.cs
@@ -81,41 +81,9 @@ internal static TResult? _JavaCast<
 			if (instance.Handle == IntPtr.Zero)
 				throw new ObjectDisposedException (instance.GetType ().FullName);
 
-			Type resultType = typeof (TResult);
-			if (resultType.IsClass) {
-				return (TResult) CastClass (instance, resultType);
-			}
-			else if (resultType.IsInterface) {
-				return (TResult?) Java.Lang.Object.GetObject (instance.Handle, JniHandleOwnership.DoNotTransfer, resultType);
-			}
-			else
-				throw new NotSupportedException (FormattableString.Invariant ($"Unable to convert type '{instance.GetType ().FullName}' to '{resultType.FullName}'."));
-		}
-
-		static IJavaObject CastClass (
-				IJavaObject instance,
-				[DynamicallyAccessedMembers (Constructors)]
-				Type resultType)
-		{
-			var klass = JNIEnv.FindClass (resultType);
-			try {
-				if (klass == IntPtr.Zero)
-					throw new ArgumentException ("Unable to determine JNI class for '" + resultType.FullName + "'.", "TResult");
-				if (!JNIEnv.IsInstanceOf (instance.Handle, klass))
-					throw new InvalidCastException (
-							FormattableString.Invariant ($"Unable to convert instance of type '{instance.GetType ().FullName}' to type '{resultType.FullName}'."));
-			} finally {
-				JNIEnv.DeleteGlobalRef (klass);
-			}
-
-			if (resultType.IsAbstract) {
-				// TODO: keep in sync with TypeManager.CreateInstance() algorithm
-				var invokerType = GetInvokerType (resultType);
-				if (invokerType == null)
-					throw new ArgumentException ("Unable to get Invoker for abstract type '" + resultType.FullName + "'.", "TResult");
-				resultType = invokerType;
-			}
-			return (IJavaObject) TypeManager.CreateProxy (resultType, instance.Handle, JniHandleOwnership.DoNotTransfer);
+			return (TResult) Java.Lang.Object.GetObject (instance.Handle, JniHandleOwnership.DoNotTransfer, typeof (TResult)) ??
+				throw new InvalidCastException (
+					FormattableString.Invariant ($"Unable to convert instance of type '{instance.GetType ().FullName}' to type '{typeof (TResult).FullName}'."));
 		}
 
 		internal static IJavaObject? JavaCast (
@@ -132,14 +100,9 @@ static IJavaObject CastClass (
 			if (resultType.IsAssignableFrom (instance.GetType ()))
 				return instance;
 
-			if (resultType.IsClass) {
-				return CastClass (instance, resultType);
-			}
-			else if (resultType.IsInterface) {
-				return (IJavaObject?) Java.Lang.Object.GetObject (instance.Handle, JniHandleOwnership.DoNotTransfer, resultType);
-			}
-			else
-				throw new NotSupportedException (FormattableString.Invariant ($"Unable to convert type '{instance.GetType ().FullName}' to '{resultType.FullName}'."));
+			return (IJavaObject?) Java.Lang.Object.GetObject (instance.Handle, JniHandleOwnership.DoNotTransfer, resultType) ??
+				throw new InvalidCastException (
+					FormattableString.Invariant ($"Unable to convert instance of type '{instance.GetType ().FullName}' to type '{resultType.FullName}'."));
 		}
 
 		// typeof(Foo) -> FooInvoker
diff --git a/src/Mono.Android/Java.Interop/TypeManager.cs b/src/Mono.Android/Java.Interop/TypeManager.cs
index 3f21ea04435..334a9f542a8 100644
--- a/src/Mono.Android/Java.Interop/TypeManager.cs
+++ b/src/Mono.Android/Java.Interop/TypeManager.cs
@@ -336,7 +336,6 @@ internal static IJavaPeerable CreateInstance (IntPtr handle, JniHandleOwnership
 
 				handleClass = JniEnvironment.Types.GetObjectClass (new JniObjectReference (handle));
 				if (!JniEnvironment.Types.IsAssignableFrom (handleClass, typeClass)) {
-					Logger.Log (LogLevel.Info, "*jonp*", $"# jonp: can't assign `{GetClassName(handleClass.Handle)}` to `{GetClassName(typeClass.Handle)}`");
 					return null;
 				}
 			} finally {
diff --git a/tests/Mono.Android-Tests/Java.Interop/JavaObjectExtensionsTests.cs b/tests/Mono.Android-Tests/Java.Interop/JavaObjectExtensionsTests.cs
index e6b133a4eaf..e5e56a839a6 100644
--- a/tests/Mono.Android-Tests/Java.Interop/JavaObjectExtensionsTests.cs
+++ b/tests/Mono.Android-Tests/Java.Interop/JavaObjectExtensionsTests.cs
@@ -40,6 +40,32 @@ public void JavaCast_InterfaceCast ()
 			}
 		}
 
+		[Test]
+		public void JavaCast_BadInterfaceCast ()
+		{
+			using var n = new Java.Lang.Integer (42);
+			var e = Assert.Catch<Exception>(() => JavaObjectExtensions.JavaCast<Java.Lang.IAppendable> (n));
+			if (e is System.Reflection.TargetInvocationException tie) {
+				// .NET 8 behavior
+				Assert.IsTrue (tie.InnerException is InvalidCastException);
+			} else if (e is InvalidCastException ice) {
+				// Yay
+			} else {
+				Assert.Fail ($"Unexpected exception type: {e.GetType ()}: {e.ToString ()}");
+			}
+		}
+
+		[Test]
+		public void JavaCast_ObtainOriginalInstance ()
+		{
+			using var list = new Java.Util.ArrayList ();
+			using var copy = new Java.Lang.Object (list.Handle, JniHandleOwnership.DoNotTransfer);
+			using var al   = JavaObjectExtensions.JavaCast<Java.Util.AbstractList> (copy);
+
+			// Semantic change: in .NET 8, `al` is a new `AbstractListInvoker` instance, not `list`
+			Assert.AreSame (list, al);
+		}
+
 		[Test]
 		public void JavaCast_InvalidTypeCastThrows ()
 		{