How to trigger this bug 1.Create two new parts like this 2.Duplicate it 3.Delete the copied 1_2 and 2_2 4.Copy part1 and part2 again Can't save after this Cannot save even if all parts are deleted   I don't understand the code. But speculate that the situation should be like this，Each new part, the name of the part will be entered into a buffer, and a part will be deleted, the name of the corresponding part will be deleted from the buff