A.21:8 - Common mistakes

Mistake	Why it fails	Repair
Green cue as pass	No result, profile application, or check set is recoverable.	Recover the A.21 result or leave the cue non-decisional.
Merge by check label	Different subjects, criteria, regulators, or cases disappear.	Merge only identical check-application identities.
Unknown as `abstain`	A missing required fact becomes neutral and may yield pass.	Preserve `unknown`; apply an explicit profile rule.
New slice weakens checks	Locality is mistaken for policy authority.	Cite another applicable policy fact and any required authority.
`degrade` with no action	The word sounds precise but gives no usable consequence.	State the permitted restricted action, condition, stop, and recheck.
Every gate is a LaunchGate or crossing	Optional branches become universal infrastructure.	Activate only the branch present in the decision subject and selected structure.
Every crossing has a Bridge	Structural and semantic relations are collapsed.	Use E.18 for the crossing and F.9 only for a separate semantic relation.