[bug] Python-vtk BalloonWidget example does not work with vtk 9.2.2

I can confirm this is a crash in Linux. It works Ok in Windows.

In looking at the debugger it seems to be crashing at line 112 in the function void FireTimers(vtkXRenderWindowInteractor* rwi) in vtkXRenderWindowInteractor.cxx after the first iteration, so it is probably accessing a nonexistent timer (my guess). On line 120: rwi->IsOneShotTimer(timerId) is false which may also be a clue.

I have no idea what is going on. @ben.boeckel any ideas?