Microsoft.EntityFrameworkCore.InMemory updates Attach entities

Hi,

I start to use Microsoft.EntityFrameworkCore.InMemory for testing purpose (with xunit and moq).

During my tests, I "discovered" that Microsoft.EntityFrameworkCore.InMemory update entities, even when they are marked as "Attach", while my controllers work as expected with any real database.

Is it the normal behavior for Microsoft.EntityFrameworkCore.InMemory?