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Postmortem: Squash-Merge Made HEAD~1 Target Unrelated Code

This story is from 2026-09-16. It is preserved in the archive; the latest stories are on the live feed.

The durable fix is a locked merge-base, not HEAD~1 . An agent that infers the review parent from git heuristics can patch the wrong tree. This reconstructed incident shows how that miss ships a green no-op. What Failed A coding agent received a follow-up task after a squash-merge. It treated HEAD~1…

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  1. 2026-09-16 04:24 · DEV Community — AI
    Postmortem: Squash-Merge Made HEAD~1 Target Unrelated Code

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