The Plex library search box wrote to the shared, persisted feed filter
(filters.q). That leaked a Plex query into the feed search box and, being
persisted, restored a stale query after a reload — which then collided
with a persisted collection filter to produce a confusing empty grid.
Plex now has its own search state: kept across page switches within a
session, but not persisted and not shared with the feed, so a reload
starts clean.