Auto-marking a video watched near its end invalidates the feed query; the
refetched/reordered queue can no longer contain the playing item, so
findIndex returned -1 and the active item fell back to queue[0] — silently
jumping playback to an unrelated video and defeating Loop "One" (and
auto-advance:off). Pin the last resolved video in a ref and keep playing it
when it drops out of the queue instead of snapping to queue[0].
peter
08ab02ddea