This happens in Glyphs 3.0.3 (3061), macOS 11.2 (20D64):
Had the same in an earlier version, too (around before 3050-ish). macOS 11.1 and 11.2
Good that I just got my new M1 Air. I have fixed it.
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That ended up in the ‘future’ branch.
Still part of the future, 3.0.3 (3063) does not fix the issue for me. (It’s not a big issue, I just want to note this in case it was unintentional.)