80da1bb3e2d054dedf069d7e3d2974430721de46
The stale-prefetch reset effect compared prefetchedFor against nextChapter only, so when landing on chapter N+1 (prefetchedFor=N+1, nextChapter=N+2) it would destroy the pre-fetched URL before startPlayback() could use it, breaking every auto-next transition after the first. Fix: also allow prefetchedFor === chapter (current page) so the URL survives long enough to be consumed, then only wipe truly foreign values.
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