wrong identification index while change from a scope to another

[jimy-byerley]

while showing objects from scope to scope in https://github.com/jimy-byerley/walker/blob/master/gearbox/strainwave.py

Traceback (most recent call last):
  File "/home/jimy/.local/lib/python3.11/site-packages/madcad/rendering/d3/view.py", line 292, in event
    self.inputEvent(evt)
  File "/home/jimy/.local/lib/python3.11/site-packages/uimadcad/sceneview.py", line 361, in inputEvent
    super().inputEvent(event)
  File "/home/jimy/.local/lib/python3.11/site-packages/madcad/rendering/d3/view.py", line 338, in inputEvent
    key = self.displayat(pos)
          ^^^^^^^^^^^^^^^^^^^
  File "/home/jimy/.local/lib/python3.11/site-packages/madcad/rendering/d3/view.py", line 634, in displayat
    print('wrong identification index', ident, self.scene.stacks['ident'][-1])
                                               ~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^
IndexError: list index out of range