[Bug 1874096]

[Amy-i]

As far as I understand it, this is a race condition inside PyQt5 related
to the order of destruction of Python-based QObject instances. Since the
call that trigger the crash is the destruction of the plugin itself
(which in turn stops the Python engine, etc... as your stacktrace
shows), I believe only the PyQt5 authors can solve it.

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Title:
  Closing Krita normally always result in "Krita closed unexpectedly"
  notification on Plasma

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