sylpheed-port's contract-check perturbs the FIRST occurrence of an anchor. My supersession marker quoted the 'EXTRAS resets, the main menu persists' heading verbatim, so the sentence appeared twice and the control read the untouched duplicate and passed a wrong contract. The marker existed because they had told me a grep lands mid-document, so the fix for one navigation problem created another. Pointers now name their targets by date and subject instead of reproducing the heading. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Wuu56cE8vJGTBtn1ppsk8v