'The object has been removed from the model.' when building model

[ChristopherHaws]

I am getting 'The object has been removed from the model.' when building a model. I have simplified my scenario down and found that this is happening when configuring the second owned type, each of which are the same .NET type, and the first owned type is using HasIndex.

Code to Reproduce

async Task Main() {
    var services = new ServiceCollection();

    services.AddDbContext<ApplicationContext>(db => {
        //db.UseSqlServer(@"Server=(localdb)\mssqllocaldb; Database=test; Trusted_Connection=True; MultipleActiveResultSets=true")
        //    .EnableDetailedErrors()
        //    .EnableSensitiveDataLogging();
        db.UseInMemoryDatabase(Guid.NewGuid().ToString());
    });

    using var root = services.BuildServiceProvider();
    using var scope = root.CreateScope();

    var db = scope.ServiceProvider.GetRequiredService<ApplicationContext>();
    //await db.Database.EnsureDeletedAsync();
    await db.Database.EnsureCreatedAsync();
}

public class ApplicationContext : DbContext {
    public ApplicationContext(DbContextOptions<ApplicationContext> options)
        : base(options) {
    }

    public DbSet<Author> Authors { get; set; } = default!;

    protected override void OnModelCreating(ModelBuilder model) {
        model.Entity<Author>(author => {    
            author.OwnsOne(x => x.PrimaryContact, primaryContact => {
                primaryContact.HasIndex(x => x.PhoneNumber);
            });

            author.OwnsOne(x => x.SecondaryContact);
        });
    }
}

public sealed class Author {
    public Guid AuthorId { get; init; } = default!;
    public Contact PrimaryContact { get; init; } = default!;
    public Contact SecondaryContact { get; init; }
}

public sealed class Contact {
    public string PhoneNumber { get; init; } = default!;
    public string EmailAddress { get; init; } = default!;
}

Stack Trace

System.InvalidOperationException: The object has been removed from the model.
   at Microsoft.EntityFrameworkCore.Metadata.Internal.EntityType.get_Builder()
   at Microsoft.EntityFrameworkCore.Metadata.Internal.PropertiesSnapshot.Attach(InternalEntityTypeBuilder entityTypeBuilder)
   at Microsoft.EntityFrameworkCore.Metadata.Internal.EntityType.Snapshot.Attach(InternalEntityTypeBuilder entityTypeBuilder)
   at Microsoft.EntityFrameworkCore.Metadata.Internal.InternalModelBuilder.Entity(TypeIdentity& type, ConfigurationSource configurationSource, Nullable`1 shouldBeOwned)
   at Microsoft.EntityFrameworkCore.Metadata.Internal.InternalModelBuilder.SharedTypeEntity(String name, Type type, ConfigurationSource configurationSource, Nullable`1 shouldBeOwned)
   at Microsoft.EntityFrameworkCore.Metadata.Internal.InternalForeignKeyBuilder.MakeDeclaringTypeShared(Nullable`1 configurationSource)
   at Microsoft.EntityFrameworkCore.Metadata.Internal.InternalEntityTypeBuilder.GetTargetEntityTypeBuilder(TypeIdentity targetEntityType, MemberIdentity navigation, Nullable`1 configurationSource, Nullable`1 targetShouldBeOwned)
   at Microsoft.EntityFrameworkCore.Metadata.Internal.InternalEntityTypeBuilder.HasOwnership(TypeIdentity& targetEntityType, MemberIdentity& navigation, Nullable`1 inverse, ConfigurationSource configurationSource)
   at Microsoft.EntityFrameworkCore.Metadata.Internal.InternalEntityTypeBuilder.HasOwnership(TypeIdentity& typeIdentity, MemberIdentity navigation, ConfigurationSource configurationSource)
   at Microsoft.EntityFrameworkCore.Metadata.Builders.EntityTypeBuilder`1.OwnsOneBuilder[TRelatedEntity](TypeIdentity ownedType, MemberIdentity navigation)
   at Microsoft.EntityFrameworkCore.Metadata.Builders.EntityTypeBuilder`1.OwnsOne[TRelatedEntity](Expression`1 navigationExpression, Action`1 buildAction)
   at UserQuery.ApplicationContext.<>c.<OnModelCreating>b__5_0(EntityTypeBuilder`1 author) in C:\Users\cribs\AppData\Local\Temp\LINQPad6\_sxpcqoeo\udvecs\LINQPadQuery:line 38
   at Microsoft.EntityFrameworkCore.ModelBuilder.Entity[TEntity](Action`1 buildAction)
   at UserQuery.ApplicationContext.OnModelCreating(ModelBuilder model) in C:\Users\cribs\AppData\Local\Temp\LINQPad6\_sxpcqoeo\udvecs\LINQPadQuery:line 33
   at Microsoft.EntityFrameworkCore.Infrastructure.ModelSource.CreateModel(DbContext context, IConventionSetBuilder conventionSetBuilder, ModelDependencies modelDependencies)
   at Microsoft.EntityFrameworkCore.Infrastructure.ModelSource.GetModel(DbContext context, ModelCreationDependencies modelCreationDependencies, Boolean designTime)
   at Microsoft.EntityFrameworkCore.Internal.DbContextServices.CreateModel(Boolean designTime)
   at Microsoft.EntityFrameworkCore.Internal.DbContextServices.get_Model()
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitCache(ServiceCallSite callSite, RuntimeResolverContext context, ServiceProviderEngineScope serviceProviderEngine, RuntimeResolverLock lockType)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitScopeCache(ServiceCallSite callSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSite(ServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitConstructor(ConstructorCallSite constructorCallSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitCache(ServiceCallSite callSite, RuntimeResolverContext context, ServiceProviderEngineScope serviceProviderEngine, RuntimeResolverLock lockType)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitScopeCache(ServiceCallSite callSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSite(ServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitConstructor(ConstructorCallSite constructorCallSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitCache(ServiceCallSite callSite, RuntimeResolverContext context, ServiceProviderEngineScope serviceProviderEngine, RuntimeResolverLock lockType)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitScopeCache(ServiceCallSite callSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSite(ServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitConstructor(ConstructorCallSite constructorCallSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitCache(ServiceCallSite callSite, RuntimeResolverContext context, ServiceProviderEngineScope serviceProviderEngine, RuntimeResolverLock lockType)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitScopeCache(ServiceCallSite callSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSite(ServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitConstructor(ConstructorCallSite constructorCallSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitCache(ServiceCallSite callSite, RuntimeResolverContext context, ServiceProviderEngineScope serviceProviderEngine, RuntimeResolverLock lockType)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitScopeCache(ServiceCallSite callSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSite(ServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitConstructor(ConstructorCallSite constructorCallSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitCache(ServiceCallSite callSite, RuntimeResolverContext context, ServiceProviderEngineScope serviceProviderEngine, RuntimeResolverLock lockType)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitScopeCache(ServiceCallSite callSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSite(ServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.Resolve(ServiceCallSite callSite, ServiceProviderEngineScope scope)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.DynamicServiceProviderEngine.<>c__DisplayClass1_0.<RealizeService>b__0(ServiceProviderEngineScope scope)
   at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService(IServiceProvider provider, Type serviceType)
   at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService[T](IServiceProvider provider)
   at Microsoft.EntityFrameworkCore.DbContext.get_DbContextDependencies()
   at Microsoft.EntityFrameworkCore.DbContext.get_ContextServices()
   at Microsoft.EntityFrameworkCore.DbContext.Microsoft.EntityFrameworkCore.Infrastructure.IInfrastructure<System.IServiceProvider>.get_Instance()
   at Microsoft.EntityFrameworkCore.Infrastructure.Internal.InfrastructureExtensions.GetService[TService](IInfrastructure`1 accessor)
   at Microsoft.EntityFrameworkCore.Infrastructure.DatabaseFacade.get_Dependencies()
   at Microsoft.EntityFrameworkCore.Infrastructure.DatabaseFacade.EnsureCreatedAsync(CancellationToken cancellationToken)
   at UserQuery.Main() in C:\Users\cribs\AppData\Local\Temp\LINQPad6\_sxpcqoeo\udvecs\LINQPadQuery:line 19

Provider and version information

Regression: Works in 5.0.7
EF Core version: 6.0.0-preview.5.21301.9
Database provider: Microsoft.EntityFrameworkCore.SqlServer or Microsoft.EntityFrameworkCore.InMemoryDatabase
Target framework: .NET 6.0.100-preview.5.21302.13
Operating system: Windows 10
IDE: Visual Studio 2019, Visual Studio 2022, LinqPad