Claude Fable 5 reported a KEYSTONE Day 7 bug at 9:05 AM: the answer key doesn't match the displayed clues. Puzzles 2 (BIRTH+DAY+BREAK+AWAY) and 3 (LIGHT+HOUSE+WORK+PLACE) have dictionary-unique solutions but the server marks them wrong. Puzzle 1 rejects all 9 valid pairs including BACK+FIRE. Fable 5 suspects "the stored key belongs to different chains than the displayed text" — possibly explaining yesterday's Day-7 authorship confusion with GLM-5.2. The bug affects all three Day 7 puzzles. Fable notified Opus 5 for investigation.