Exception using LazyLoading When sharing same .Net Type among multiple owned types

[AmilaDotDev]

{System.NullReferenceException: Object reference not set to an instance of an object.
   at lambda_method(Closure , QueryContext , Person , Object[] )
   at Microsoft.EntityFrameworkCore.Query.Internal.IncludeCompiler._Include[TEntity](QueryContext queryContext, TEntity entity, Object[] included, Action`3 fixup)
   at lambda_method(Closure , TransparentIdentifier`2 )
   at System.Linq.Enumerable.SelectEnumerableIterator`2.MoveNext()
   at System.Linq.Enumerable.TryGetFirst[TSource](IEnumerable`1 source, Boolean& found)
   at lambda_method(Closure )
   at Microsoft.EntityFrameworkCore.Query.Internal.LinqOperatorProvider.ResultEnumerable`1.GetEnumerator()
   at Microsoft.EntityFrameworkCore.Query.Internal.LinqOperatorProvider.<_TrackEntities>d__17`2.MoveNext()
   at Microsoft.EntityFrameworkCore.Query.Internal.LinqOperatorProvider.ExceptionInterceptor`1.EnumeratorExceptionInterceptor.MoveNext()
   at System.Linq.Enumerable.TryGetFirst[TSource](IEnumerable`1 source, Boolean& found)
   at System.Linq.Enumerable.First[TSource](IEnumerable`1 source)
   at Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.<>c__DisplayClass15_1`1.<CompileQueryCore>b__0(QueryContext qc)
   at System.Linq.Queryable.FirstOrDefault[TSource](IQueryable`1 source)
   at OwnedTypes.NotWorking.Program.Main(String[] args) in ...\OwnedTypes\OwnedTypes.NotWorking\Program.cs:line 26}

Steps to reproduce

Please take a look at the solution in the following repo.
https://github.com/amilarox1/OwnedTypes

The solution has two projects. OwnedTypes & OwnedTypes.NotWorking

OwnedTypes.NotWorking project is using Microsoft.EntityFrameworkCore.Proxies 2.1.0-rc1 and all the navigation properties are virtual (including owned types) and this causes the above exception when queriying data from the database.

Please check the ReadMe.md in the repo for more information

Further technical details
EF Core version: 2.1.0-rc1
Database Provider: SqlServer 2.1.0-rc1
Operating system: Win10
IDE: Visual Studio 2017 15.6.6

[ajcvickers]

@amilarox1 Thanks for filing this. Turns out it was a duplicate of the same root cause, so closing this as a duplicate of the original issue (but using your title for that one!)