Calling Find on a DBSet does not return results w/o calling ToList() first.

Example:
            using (var connection = new SQLiteConnection("Data Source=:memory:"))
            {
                connection.Open();
                var id = Guid.NewGuid();

                using (var context = new TestDBSQLiteContext(connection))
                {
                    var customer = new Customer {Id = id, SisNumber = "1234567"};
                    context.Customers.Add(customer);

                    context.SaveChanges();
                }

                using (var context = new TestDBSQLiteContext(connection))
                {
                    this should write the sis number (but does not)
                    Console.WriteLine(context.Customers.Find(id)?.SisNumber ?? "<NULL>");
                }

                using (var context = new TestDBSQLiteContext(connection))
                {
                    var dummy = context.Customers.ToList();
                    here it gets written
                    Console.WriteLine(context.Customers.Find(id)?.SisNumber ?? "<NULL>");
                }
            }

I can provide a complete test program, if required.