What are EF Core 2.1 changes in owned types?

Docs last changed at 02/26/2018, but there is some breaking changes that I need to fix.

I have MyProcessContext type, used as owned for many entities:

public class RequestData
{
    public Guid CorrelationId { get; set; }
    public DateTime Updated { get; set; }

    public MyProcessContext ProcessContext { get; set; }
}

public class MyProcessContext
{
    public int ClientId { get; set; }
}

public class EntityConfiguration : IEntityTypeConfiguration<RequestData>
{
    public void Configure(EntityTypeBuilder<RequestData> builder)
    {
        // all mapped by convention

        builder.OwnsOne(x => x.ProcessContext);

        builder.Property(x => x.Updated).IsRowVersion();

        builder.HasKey(x => x.CorrelationId);
        builder.Property(x => x.CorrelationId).ValueGeneratedNever();
    }
}

It works as expected with EF Core 2.0. In debug view I have different entity type for each usage of owned type (RequestData.ProcessContext#MyProcessContext):

  EntityType: RequestData
    Properties: 
      CorrelationId (Guid) Required PK AfterSave:Throw 0 0 0 -1 -1
        Annotations: 
          Relational:ColumnName: correlation_id      
      Updated (DateTime) Required Concurrency BeforeSave:Ignore AfterSave:Ignore ValueGenerated.OnAddOrUpdate 11 11 -1 -1 0
        Annotations: 
          Relational:ColumnName: updated
    Navigations: 
      ProcessContext (<ProcessContext>k__BackingField, MyProcessContext) ToDependent RequestData.ProcessContext#MyProcessContext 0 -1 1 -1 -1
    Keys: 
      CorrelationId PK
    Annotations: 
      Relational:TableName: process_request
      RelationshipDiscoveryConvention:NavigationCandidates: System.Collections.Immutable.ImmutableSortedDictionary`2[System.Reflection.PropertyInfo,System.Type]

  EntityType: RequestData.ProcessContext#MyProcessContext
    Properties: 
      RequestDataCorrelationId (no field, Nullable<Guid>) Shadow Required PK FK AfterSave:Throw 0 0 0 0 -1
      ClientId (int) Required 1 1 -1 -1 -1      
    Keys: 
      RequestDataCorrelationId PK
    Foreign keys: 
      RequestData.ProcessContext#MyProcessContext {'RequestDataCorrelationId'} -> RequestData {'CorrelationId'} Unique ToDependent: ProcessContext
    Annotations: 
      Relational:TableName: process_request
      RelationshipDiscoveryConvention:NavigationCandidates: System.Collections.Immutable.ImmutableSortedDictionary`2[System.Reflection.PropertyInfo,System.Type]    

After upgrade debug view contains

  EntityType: RequestData
      ...
      ProcessContext (<ProcessContext>k__BackingField, MyProcessContext) ToDependent MyProcessContext 0 -1 1 -1 -1
      ...
  EntityType: MyProcessContext
    Properties: 
      RequestDataCorrelationId (no field, Guid) Shadow Required PK FK AfterSave:Throw 0 0 0 0 -1
      ClientId (int) Required 1 1 -1 -1 -1
    Keys: 
      RequestDataCorrelationId PK
    Foreign keys: 
      MyProcessContext {'RequestDataCorrelationId'} -> RequestData {'CorrelationId'} Unique Ownership ToDependent: ProcessContext
    Annotations: 
      Relational:TableName: process_request
      RelationshipDiscoveryConvention:NavigationCandidates: System.Collections.Immutable.ImmutableSortedDictionary`2[System.Reflection.PropertyInfo,System.Type]

Model built like MyProcessContext is usual entity. In code like

foreach (var entity in modelBuilder.Model.GetEntityTypes())
            {
                var entityIsOwned = entity.IsOwned();

entityIsOwned is true, but entity.DefiningNavigationName is null now.

I need that name for custom name convention.