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A single sed line silently corrupted blog posts by deleting all markdown fence closers

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A developer's automated blog pipeline was quietly producing corrupted posts where all content after the first code block appeared as gray monospace text. The culprit was a sed expression intended to strip AI-generated markdown wrapper fences, but it inadvertently deleted every bare triple-backtick line in the document, removing all code block closing markers. Because an unclosed markdown fence is valid CommonMark syntax, no build errors were raised — Astro, Zod, and the markdown linter all passed without complaint. The bug had gone unnoticed partly because the previous local model backend rarely emitted the wrapper that triggered the cleanup rule, only surfacing after the pipeline was migrated to a cloud-based model. The fix required replacing the broad pattern-match with logic that targets only the specific outer wrapper fences rather than all bare backtick lines.

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A single sed line silently corrupted blog posts by deleting all markdown fence closers · ShortSingh