Anchor configs placed rewrittenLine at floor(size/2) while anchors sat 8-1875 lines away. With Diff.structuredPatch using context=3, no hunk's context overlapped the rewrite, so applyEditsToSnapshot's 3-way merge succeeded on the first try and replaySessionChainOnCurrent (the path the bench claims to pin) was never invoked for the 6 accept cases. The sanity probe only checked probe !== null, which both branches satisfy, so the misalignment was silent.
Move rewrittenLine to anchors[0]-1 for accept cases so the first hunk's context actually spans the rewrite, forcing applyPatch failure and replay invocation. Strengthen the sanity check to require RECOVERY_SESSION_REPLAY_WARNING (only emitted past verifyAnchorContent) on every accept case so a future regression fails loudly instead of silently measuring the wrong path.
oldschoola
60bfc375c4