MAL/AniList season entries never matched the library show they belong to.
Both backends use the catalog title as a server-side filter before verifying
external ids, and a title like "Mushoku Tensei: Jobless Reincarnation Season 2"
cannot reach a show stored as "Mushoku Tensei: Jobless Reincarnation". Measured
against a 267-show Plex library, 3 of 113 mapped sequel entries matched.
The reverse lookup now takes two ordered title candidates instead of one: the
entry's own title and its season-stripped form, with typographic punctuation
normalised because both servers miss on a curly apostrophe. That matches 77 of
113. Widening it further to romaji/native/synonym variants reached only 81, so
the cap stays at two rather than spending up to five more requests per lookup
that finds nothing.
A sequel's year is its own season's, not the parent show's, so the +/-1 year
window is dropped for one - it would exclude the very show being looked for.
That also keeps a miss at the two requests the single-title lookup already
spent. A Plex Discover item additionally skips the title search entirely by
filtering on the plex:// guid its own rating key already is, which costs no
extra request and needs no cloud lookup.
A season 2+ entry only matches when the server really has that season, which
costs one children fetch on a match. Only a season both TVDB and TMDB agree on
is gated: which provider a library numbers its seasons by is a server setting
no dataset supplies and none of it is inferable from the ids an item exposes,
so a disagreeing reference is left ungated rather than gated on a guess.
The match cache is keyed per source and per entry rather than by canonical id,
which every season of a series shares: all five Mushoku Tensei entries collapse
to imdb:tt13293588, so one season-gated result would have poisoned the rest.
Entries whose Fribb row carries no provider id at all remain unmatched. That is
an upstream mapping gap, not something to guess around with extra lookups.
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