HasIndex returns the wrong type for owned entities

[ChristopherHaws]

It looks like OwnedNavigationBuilder.HasIndex is returning the wrong type. I believe it should return IndexBuilder<TDependentEntity>. In the code sample below, I cannot IncludeProperties from the type since it is showing the parent type's properties.

efcore/src/EFCore/Metadata/Builders/OwnedNavigationBuilder`.cs

Line 182 in 2738442

public virtual IndexBuilder<TEntity> HasIndex([NotNull] Expression<Func<TDependentEntity, object>> indexExpression)

Include your code

public sealed class Blog {
    public int BlogId { get; set; }
    public string Name { get; set; } = default!;

    public ICollection<Post> Posts { get; set; } = new HashSet<Post>();

    public sealed class Post {
        public int BlogId { get; set; }
        public int PostId { get; set; }
        public string Name { get; set; } = default!;
        public DateTime PostedDate { get; set; }
    }

    internal class EntityConfiguration : IEntityTypeConfiguration<Blog> {
        public void Configure(EntityTypeBuilder<Blog> entity) {
            entity.ToTable(nameof(Blog));
            entity.HasKey(x => x.BlogId).IsClustered();

            entity.OwnsMany(x => x.Posts, post => {
                post.ToTable(nameof(Post));
                post.HasKey(x => x.PostId).IsClustered();
                post.HasIndex(x => x.BlogId).IncludeProperties(x => x.PostedDate); // This line has build errors
            });
        }
    }
}

Include provider and version information

EF Core version: 5.0.1
Database provider: Microsoft.EntityFrameworkCore.SqlServer
Target framework: .NET 5.0
Operating system: Windows 10
IDE: Visual Studio 2019 16.8.4