Bubi

All AssertCompile are commented out

It's not a provider issue. Actually Entity Framework Core does not support lazy load. https://blogs.msdn.microsoft.com/dotnet/2017/08/14/announcing-entity-framework-core-2-0/ If you need lazy load you need to use EF 6.2. Probably the tutorial is...

Did you mark Person.OwenedCars as virtual?

As you noted, actually relationships are not enforced with contraints on the database. The problem is that EF migration pipeline is written for databases that supports ALTER TABLE ADD CONSTRAINT...

Probably you can find an answer faster asking on stack overflow.

Looking at tests results UK are retrieved correctly. EF does not enforce 1-1 using them (but looking at original tests results it should do).

Don't know. Actually that 3.x is next to be released could be helpful.

The provider uses OleDB and the Jet/ACE OleDB provider so it will run only on Windows. I think that it will have the same behaviour of System.Windows.Forms (that we probably...

As far as I know System.Data.OleDb will be available only in .Net Standard 3 so actually it's not possible. I think that the needs to make it compatible with .Net...

I could reproduce the problem with EF 2.1.0. It seems to be an EF 2.1.0 bug now closed. https://github.com/aspnet/EntityFrameworkCore/issues/11689 Could you confirm that with EF 2.1.1 works?