Well, I assumed one shouldn’t have to do that that. But I got tired of glyphs disappearing so I actually did that just now. However, I upgraded to the latest beta now, maybe that will solve the problem.
Closing/re-open is a brutal was to deal with the undo but. But as Sebastian pointed out, this is fixed in the cutting edge version.
Great! I am using the cutting edge version now. Let’s hope these disappearing glyphs are a thing of the past.