X_GATE_CODE_BACKLOG_STALE
Means
a code pinned in scripts/gate-codes-backlog.ts that this page is no longer wrong about
Typical cause
the row was written or the code was added to the list and the pin was not deleted — a pin nobody removes is a pin nobody reads
Fix
delete that code from scripts/gate-codes-backlog.ts; the fix line names it verbatim