Fix #21953: Crash on regroup rhythms in some scores (4.3.0)#22315

RomanPudashkin merged 1 commit intomusescore:4.3.0musescore/MuseScore:4.3.0from

mathesoncalum:21953-regroup_rhythms_crash-430mathesoncalum/MuseScore:21953-regroup_rhythms_crash-430Copy head branch name to clipboard