问题 I am trying to group join in EF core 3.1 the problem it returns Processing of the LINQ expression 'DbSet failed. This may indicate either a bug or a limitation in EF Core my code is like this var employees = await (from enrollment in RepositoryContext.Enrollments join allowance in RepositoryContext.Allowances.Include(y=>y.AllowanceType) on enrollment.EmployeeId equals allowance.EmployeeId into allowances select new { enrollment, allowances } ).AsNoTracking().ToListAsync(); the allowances is