Hi, the fix has definitely improved things, and decreased the frequency of the glitch, but after several days of it being okay, today the glitch reappeared on this timeline:
https://www.worldanvil.com/p/timeline/edit/8c3a631e-260e-4ffb-a376-5b8daa09b98a
I'm viewing it in mode, trying to add an event, but it just loads forever and never actually creates the event.
Refreshing the timeline temporarily fixes it, but assuming the bug operates the same way following the recent fix, it will reoccur.