efcore: Precompiled queries assume the model for a given DbContext will never change

Steps to reproduce

when I use EF.CompileQuery to generate a Query it fails to find the result. executing the linq normally returns the result.

I also verified that it is not a threading issue. the item is there all the time and if im setting the debugger to call FindItemQuery again it still returns null.

The behavior is observed in a unittest. using xunit. If the test is executed alone it works most of the time. If I execute all the tests it sometimes returns null

var services = new ServiceCollection()
                .AddDbContext<DbContext>(o => o.UseInMemoryDatabase(nameof(TestClass)+ nameof(TestMethod)))
                .BuildServiceProvider();


private static readonly Func<DbContext, string, Item> FindItemQuery =
            EF.CompileQuery<DbContext, string, Item>((ctx, key) => ctx.Items
                .FirstOrDefault(x => x.Key == key));

        protected override Item FindItem(DbContext dbContext, string key)
        {
            var found = FindItemQuery(dbContext, key);

            if (found == null)
            {
                var xxx = dbContext.Items.FirstOrDefault(t => t.Key== key);
                //xxx is not null
            }

            return found ?? new Item()
            {
                Key = key
            };
        }

Further technical details

EF Core version: Microsoft.EntityFrameworkCore.InMemory Version=“2.1.2” Operating system: Win 10 IDE: (Visual Studio 2017 15.8)