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A second review pass over the pool. All three are the same shape: state or a listener outliving the video it belonged to. attachProxyFallback replaces whatever fallback an image currently has, so a call arriving late -- a race hitting its patience timeout after the card was recycled -- took away the live listener and left a dead one, and the new video's thumbnail would then fail with nothing behind it. This one was self-inflicted: the detach came in last round to stop the listeners accumulating, and introduced the clobber. It is token-guarded now, like every other path that can arrive late. The favourite pop is cleared by animationend, which never fires on a card release() has already detached -- detached elements run no animations. So the class rode into the pool and replayed on the next video the card showed. Favourite something and flick-scroll to see it. And withOrigin compared a token that dataset reports as undefined for an unstamped card, which matched every unstamped card instead of none -- failing open in the guard whose whole purpose is noticing that the grid has recycled the card out from under the player. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01QBDkEXP4htyXTCZUwMLphd