Exception with 2 required self-ref navigations

I have the following DbContext:
```C#
public class MyDbContext : DbContext
{
public DbSet Companies { get; set; }

protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
//reproducible on both npgsql & sqlite providers
//optionsBuilder.UseNpgsql("fake");
optionsBuilder.UseSqlite("Filename=:memory:");
}

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.HasDefaultSchema("test");
var entity = modelBuilder.Entity();
entity.ToTable("company");
entity.HasKey(i => i.Id);
entity.HasOne(i => i.ParentCompany).WithMany().HasForeignKey(i => i.ParentCompanyId);
entity.HasOne(i => i.BackupCompany).WithOne().HasForeignKey(i => i.BackupCompanyId);
}
}
```
and the following entity:
```C#
public class Company
{
public int Id { get; set; }

public int? ParentCompanyId { get; set; }

public Company ParentCompany { get; set; }

public int? BackupCompanyId { get; set; }

public Company BackupCompany { get; set; }
}
```
If I run `add-migration init` to create a migration I get the following error:
```
System.InvalidOperationException: The foreign key {'ParentCompanyId'} on the entity type 'Company' cannot have a required dependent end since it is not unique.
at Microsoft.EntityFrameworkCore.Metadata.Internal.ForeignKey.SetIsRequiredDependent(Nullable`1 required, ConfigurationSource configurationSource)
at Microsoft.EntityFrameworkCore.Metadata.Internal.InternalForeignKeyBuilder.IsRequiredDependent(Nullable`1 required, ConfigurationSource configurationSource)
at Microsoft.EntityFrameworkCore.Metadata.Internal.InternalForeignKeyBuilder.ReplaceForeignKey(InternalEntityTypeBuilder principalEntityTypeBuilder, InternalEntityTypeBuilder dependentEntityTypeBuilder, Nullable`1 navigationToPrincipal, Nullable`1 navigationToDependent, IReadOnlyList`1 dependentProperties, IReadOnlyList`1 oldNameDependentProperties, IReadOnlyList`1 principalProperties, Nullable`1 isUnique, Nullable`1 isRequired, Nullable`1 isRequiredDependent, Nullable`1 isOwnership, Nullable`1 deleteBehavior, Boolean removeCurrent, Boolean oldRelationshipInverted, Nullable`1 principalEndConfigurationSource, ConfigurationSource configurationSource)
at Microsoft.EntityFrameworkCore.Metadata.Internal.InternalForeignKeyBuilder.ReplaceForeignKey(ConfigurationSource configurationSource, InternalEntityTypeBuilder principalEntityTypeBuilder, InternalEntityTypeBuilder dependentEntityTypeBuilder, Nullable`1 navigationToPrincipal, Nullable`1 navigationToDependent, IReadOnlyList`1 dependentProperties, IReadOnlyList`1 oldNameDependentProperties, IReadOnlyList`1 principalProperties, Nullable`1 isUnique, Nullable`1 isRequired, Nullable`1 isRequiredDependent, Nullable`1 isOwnership, Nullable`1 deleteBehavior, Boolean removeCurrent, Nullable`1 principalEndConfigurationSource, Boolean oldRelationshipInverted)
at Microsoft.EntityFrameworkCore.Metadata.Internal.InternalForeignKeyBuilder.HasForeignKey(IReadOnlyList`1 properties, EntityType dependentEntityType, ConfigurationSource configurationSource)
at Microsoft.EntityFrameworkCore.Metadata.Internal.InternalForeignKeyBuilder.HasForeignKey(IReadOnlyList`1 properties, ConfigurationSource configurationSource)
at Microsoft.EntityFrameworkCore.Metadata.Internal.InternalForeignKeyBuilder.Microsoft.EntityFrameworkCore.Metadata.Builders.IConventionForeignKeyBuilder.HasForeignKey(IReadOnlyList`1 properties, Boolean fromDataAnnotation)
at Microsoft.EntityFrameworkCore.Metadata.Conventions.ForeignKeyPropertyDiscoveryConvention.DiscoverProperties(IConventionForeignKeyBuilder relationshipBuilder, IConventionContext context)
at Microsoft.EntityFrameworkCore.Metadata.Conventions.ForeignKeyPropertyDiscoveryConvention.ProcessForeignKey(IConventionForeignKeyBuilder relationshipBuilder, IConventionContext context)
at Microsoft.EntityFrameworkCore.Metadata.Conventions.ForeignKeyPropertyDiscoveryConvention.ProcessForeignKeyAdded(IConventionForeignKeyBuilder relationshipBuilder, IConventionContext`1 context)
at Microsoft.EntityFrameworkCore.Metadata.Conventions.ForeignKeyPropertyDiscoveryConvention.ProcessForeignKeyPrincipalEndChanged(IConventionForeignKeyBuilder relationshipBuilder, IConventionContext`1 context)
at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.ConventionDispatcher.ImmediateConventionScope.OnForeignKeyPrincipalEndChanged(IConventionForeignKeyBuilder relationshipBuilder)
at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.ConventionDispatcher.OnForeignKeyPrincipalEndChangedNode.Run(ConventionDispatcher dispatcher)
at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.ConventionDispatcher.DelayedConventionScope.Run(ConventionDispatcher dispatcher)
at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.ConventionDispatcher.ConventionBatch.Run()
at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.ConventionDispatcher.ConventionBatch.Run(IConventionForeignKey foreignKey)
at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.ConventionBatchExtensions.Run(IConventionBatch batch, InternalForeignKeyBuilder relationshipBuilder)
at Microsoft.EntityFrameworkCore.Metadata.Internal.InternalEntityTypeBuilder.HasRelationship(EntityType targetEntityType, Nullable`1 navigationToTarget, Nullable`1 inverseNavigation, Nullable`1 setTargetAsPrincipal, ConfigurationSource configurationSource, Nullable`1 required)
at Microsoft.EntityFrameworkCore.Metadata.Internal.InternalEntityTypeBuilder.HasRelationship(EntityType targetEntityType, MemberInfo navigationMember, ConfigurationSource configurationSource, Nullable`1 targetIsPrincipal)
at Microsoft.EntityFrameworkCore.Metadata.Builders.EntityTypeBuilder.HasOneBuilder(MemberIdentity navigationId, EntityType relatedEntityType)
at Microsoft.EntityFrameworkCore.Metadata.Builders.EntityTypeBuilder`1.HasOne[TRelatedEntity](Expression`1 navigationExpression)
at WebApplication1.MyDbContext.OnModelCreating(ModelBuilder modelBuilder) in C:\Projects\WebApplication1\WebApplication1\MyDbContext.cs:line 22
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.b__8_4(IServiceProvider p)
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)
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)
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.Resolve(ServiceCallSite callSite, ServiceProviderEngineScope scope)
at Microsoft.Extensions.DependencyInjection.ServiceLookup.DynamicServiceProviderEngine.<>c__DisplayClass2_0.b__0(ServiceProviderEngineScope scope)
at Microsoft.Extensions.DependencyInjection.ServiceProvider.GetService(Type serviceType, ServiceProviderEngineScope serviceProviderEngineScope)
at Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngineScope.GetService(Type serviceType)
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.get_InternalServiceProvider()
at Microsoft.EntityFrameworkCore.DbContext.Microsoft.EntityFrameworkCore.Infrastructure.IInfrastructure.get_Instance()
at Microsoft.EntityFrameworkCore.Infrastructure.Internal.InfrastructureExtensions.GetService[TService](IInfrastructure`1 accessor)
at Microsoft.EntityFrameworkCore.Infrastructure.AccessorExtensions.GetService[TService](IInfrastructure`1 accessor)
at Microsoft.EntityFrameworkCore.Design.Internal.DbContextOperations.CreateContext(Func`1 factory)
at Microsoft.EntityFrameworkCore.Design.Internal.DbContextOperations.CreateContext(String contextType)
at Microsoft.EntityFrameworkCore.Design.Internal.MigrationsOperations.AddMigration(String name, String outputDir, String contextType, String namespace)
at Microsoft.EntityFrameworkCore.Design.OperationExecutor.AddMigrationImpl(String name, String outputDir, String contextType, String namespace)
at Microsoft.EntityFrameworkCore.Design.OperationExecutor.AddMigration.<>c__DisplayClass0_0.<.ctor>b__0()
at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.<>c__DisplayClass3_0`1.b__0()
at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.Execute(Action action)
The foreign key {'ParentCompanyId'} on the entity type 'Company' cannot have a required dependent end since it is not unique.
```
The weird thing is that if I rename `BackupCompanyId` and `BackupCompany` to `SomeCompanyId` and `SomeCompany` the command runs successfully and creates valid migration:
```C#
public class Company
{
public int Id { get; set; }

public int? ParentCompanyId { get; set; }

public Company ParentCompany { get; set; }

public int? SomeCompanyId { get; set; }

public Company SomeCompany { get; set; }
}
```
It doesn't make sense that using a different name has such impact.

It also works fine if I create a navigation property for the first FK:
```C#
public class Company
{
public int Id { get; set; }

public int? ParentCompanyId { get; set; }

public Company ParentCompany { get; set; }

public int? BackupCompanyId { get; set; }

public Company BackupCompany { get; set; }

public List Children { get; set; }
}
```
```C#
entity.HasOne(i => i.ParentCompany).WithMany(i => i.Children).HasForeignKey(i => i.ParentCompanyId);
```
I don't need it and I think it should work without it.

I'm using latest packages (6.0.4). Here's my .csproj:
```XML

net6.0
enable
enable

all
runtime; build; native; contentfiles; analyzers; buildtransitive

```
I've tested it with Postgres and Sqlite providers to make sure it's not provider-specific.

Platform: .Net 6
EF cli version: 6.0.3
Visual Studio Community 2022 64-bit 17.1.0
OS: Windows 10 Pro 64-bit