Crash on undoing setting "Beam middle" property on a single note
Somewhat related to #290217: Crash when adding text in a score containing middle beam on a rest although still a different issue.
1) Create a new score
2) Add an eighth note to its beginning
3) Set "Beam middle" mode on this note
Seems to happen starting from version 3.1. Before 3.1 "Beam middle" on a single eighth note doesn't actually create beam which is probably the reason why no crash happens.