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Caught on hardware immediately after deploying rc3 to alpha: the player kept
playing content while reporting nothing at all, throwing every 15 seconds.
Uncaught TypeError: BS.telemetrySnapshot is not a function
The page was rc3 and the bridge it ran was older. Two causes, both fixed.
CACHE_NAME stayed at rd-player-v19 across a release that changed both the
service worker's fetch strategy and the shipped /player assets. The activate
handler deletes every cache whose name does not match, so keeping the name kept
the previous shell cache alive — including a stale st-bridge.js. Bumped to v20.
Content lives in its own cache, so this costs a small shell re-download and never
re-fetches a playlist.
The deeper defect is that the call site treated an optional bridge method as
guaranteed. It was the ONLY unguarded BS.* call in the player; every other one
checks or wraps. The bridge and the page are halves of one contract but are
fetched separately, so version skew is a normal condition, not an anomaly — it
must degrade, not throw. Now guarded on typeof, so a skewed pair reports the
fields it can and keeps heartbeating.
Worth naming the failure shape: the display looked perfectly healthy. Content
played, the socket connected, the device showed online — and telemetry silently
stopped. Anything that reports health through the same path it is breaking will
fail this way.
1056 pass.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Uaeo9MvzKoyXuN6ZsbhtkL
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