Plex's tag.tag- removes comma separated tags and has no escape syntax, so
removing a tag containing a literal comma ('Action, Comedy') split it at the
separator and could over-remove siblings named 'Action' or 'Comedy'.
Fields whose removals contain a comma now defer to one removal per request
after the main edit; every request restates the kept tags and the lock, so
the sequence converges regardless of order. Removals without commas keep the
exact single-request wire shape.
Removing a tag containing a space or symbol silently did nothing: the removed values were pre-encoded and the transport encoded them again, so Plex matched nothing while the UI showed the tag gone. Folder listings and the shared list wrapper also converted every transport failure (401, 500, timeout) into a successful empty list, so an unreachable server rendered 'no folders'/'no results' with no retry while Jellyfin surfaced an error. Failures now propagate to the existing error paths, and the match screen gained one.
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