(Since 3.1.0) The issue is that the thumbnail overlay sometimes doesn't update at all, and sometimes it flickers back and forth multiple times when the video changes.
Problems:
- video ID resolution happens asynchronously via URL at arbitrary time, via siteEvents
- URL parameters are updated inconsistently while in fullscreen, so it's hard to know which video the page is playing, and there's no reliable DOM element to read the video ID from
- there are probably some race conditions in the thumbnail overlay implementation (also the abort logic isn't super airtight)
(Since 3.1.0) The issue is that the thumbnail overlay sometimes doesn't update at all, and sometimes it flickers back and forth multiple times when the video changes.
Problems: