When trying to call registerSingleCaseUnionTypes from C#, I get an InvalidOperationException

[sonicbhoc]

Describe the bug
When calling registerSingleCaseUnionTypes from C#, I get the following result:

System.InvalidOperationException: Collection was modified after the enumerator was instantiated.
   at System.Collections.Generic.SortedSet`1.Enumerator.MoveNext()
   at System.Collections.Generic.SortedDictionary`2.Enumerator.MoveNext()
   at System.Collections.Generic.SortedDictionary`2.ValueCollection.Enumerator.MoveNext()
   at Microsoft.FSharp.Collections.Internal.IEnumerator.next@246[T](FSharpFunc`2 f, IEnumerator`1 e, FSharpRef`1 started, Unit unitVar0) in D:\a\_work\1\s\src\FSharp.Core\seq.fs:line 248
   at Microsoft.FSharp.Collections.Internal.IEnumerator.filter@236.System.Collections.IEnumerator.MoveNext() in D:\a\_work\1\s\src\FSharp.Core\seq.fs:line 250
   at Microsoft.FSharp.Collections.Internal.IEnumerator.map@99.DoMoveNext(b& curr) in D:\a\_work\1\s\src\FSharp.Core\seq.fs:line 101
   at Microsoft.FSharp.Collections.Internal.IEnumerator.MapEnumerator`1.System.Collections.IEnumerator.MoveNext() in D:\a\_work\1\s\src\FSharp.Core\seq.fs:line 84
   at Microsoft.FSharp.Core.CompilerServices.RuntimeHelpers.takeOuter@322[T,TResult](ConcatEnumerator`2 x, Unit unitVar0) in D:\a\_work\1\s\src\FSharp.Core\seqcore.fs:line 323
   at Microsoft.FSharp.Collections.Internal.IEnumerator.next@246[T](FSharpFunc`2 f, IEnumerator`1 e, FSharpRef`1 started, Unit unitVar0) in D:\a\_work\1\s\src\FSharp.Core\seq.fs:line 248
   at Microsoft.FSharp.Collections.Internal.IEnumerator.filter@236.System.Collections.IEnumerator.MoveNext() in D:\a\_work\1\s\src\FSharp.Core\seq.fs:line 250
   at Microsoft.FSharp.Collections.Internal.IEnumerator.map@99.DoMoveNext(b& curr) in D:\a\_work\1\s\src\FSharp.Core\seq.fs:line 101
   at Microsoft.FSharp.Collections.Internal.IEnumerator.MapEnumerator`1.System.Collections.IEnumerator.MoveNext() in D:\a\_work\1\s\src\FSharp.Core\seq.fs:line 84
   at EntityFrameworkCore.FSharp.Extensions.ModelBuilder.RegisterSingleUnionCases(ModelBuilder ) in /Users/simon/src/EFCore.FSharp/src/EFCore.FSharp/Extensions/ModelBuilderExtensions.fs:line 88
   at EntityFrameworkCore.FSharp.Extensions.registerSingleCaseUnionTypes(ModelBuilder modelBuilder) in /Users/simon/src/EFCore.FSharp/src/EFCore.FSharp/Extensions/ModelBuilderExtensions.fs:line 97
   at GDC.TimeTracker.Database.TrackerContext.RegisterTypes(ModelBuilder builder) in C:\Users\cchristie\source\repos\qe\src\TimeTracker\Database\TrackerContext.cs:line 132
   at GDC.TimeTracker.Database.TrackerContext.OnModelCreating(ModelBuilder modelBuilder) in C:\Users\cchristie\source\repos\qe\src\TimeTracker\Database\TrackerContext.cs:line 58
   at Microsoft.EntityFrameworkCore.Infrastructure.ModelCustomizer.Customize(ModelBuilder modelBuilder, DbContext context)
   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.EntityFrameworkCore.Infrastructure.EntityFrameworkServicesBuilder.<>c.<TryAddCoreServices>b__8_4(IServiceProvider p)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitFactory(FactoryCallSite factoryCallSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSiteMain(ServiceCallSite callSite, TArgument argument)
   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.CallSiteVisitor`2.VisitCallSiteMain(ServiceCallSite callSite, TArgument argument)
   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.CallSiteVisitor`2.VisitCallSiteMain(ServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitCache(ServiceCallSite callSite, RuntimeResolverContext context, ServiceProviderEngineScope serviceProviderEngine, RuntimeResolverLock lockType)

To Reproduce
Steps to reproduce the behavior:
Call registerSingleCaseUnionTypes from C#

Expected behavior
registerSingleCaseUnionTypes registers single case union types

Desktop (please complete the following information):

• OS: Windows 10
• Browser: Edge 106
• Versions: Dotnet 6.0.402; Microsoft.CSharp 4.7; FSharp.Core 6.0.6; EntityFrameworkCore.FSharp 6.0.7