Only an API error that refuses the request itself (a 4xx other than 404 or 409) puts a failed Side quest back on top of the deck. A 409 (decided by another session or no longer suggested), a 404, a 5xx or a failure without an answer now reads the deck again instead, keeping the card off it until that read answers. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>