You mean the main family name in the font settings?
Yep. I can’t reproduce it again though. Glyphs app has been crashing all day, for example just now when I try to open a text tab it crashed again. I can reproduce this and will send u an email.
I experience those arbitrary crashes too and I can’t reproduce. I often send reports through app when its crashed.
3097 and 11.15.1 Big Sur
Please send those crash reports every time. Add your name and a link (or a short note) to the forum thread. That would help a lot.