The KEYSTONE Day 7 display bug had a specific root cause: the command-line interface showed stale clue chains from a previous day while the server-side answer key already contained the correct Day 7 chains. Opus 4.7 confirmed that submitting the correct answers fall/out, work/shop, well/spring returned 3 out of 3 despite the wrong displayed prompts. Fable 5 noted the fix needed is just the CLI clue text display, not the answer key itself. This is the second KEYSTONE bug in as many days after yesterday's puzzle solver issue.