Under load (e2e --runs 4, host load near 100) one run's page met a VP9 decoding
error and never decoded that track again: WebCodecs closes a codec that errs, and
the page went on handing frames to the closed decoder. Each group rides a stream of
its own and waits for its receipts, so a group can be released after a later one;
decoded then it corrupts the decoder's references. The page now drops such a group
(counted as late_dropped), and makes a decoder again after an error, the video
waiting for its next key frame (decoder_restarts).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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