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A RegExp route matcher advanced its own lastIndex on every request, so consecutive URLs alternated between matching and missing — and the wrong answer was cached for the process's lifetime.

Editing an order line's price, with nothing else changed, still re-reserved its full quantity as if none of it were fulfilled — and if that failed, the workflow's own rollback resurrected reservations fulfillment had already consumed, with no ceiling.

Two rapid clicks on "Get Certificate" could both pass the not-certified-yet check before either saved, producing duplicate certificate rows — closed with a DB-level unique constraint after review caught a NULL-vs-empty-string gap in the first version.

The built-in ERPNext node duplicated a row at every page boundary past 1,000 records, and crashed before making a request if Options was touched without adding a filter.

The import path panicked on any os.Stat failure other than "file does not exist" — a permissions error or a broken symlink took down the whole import instead of surfacing as a normal error.

An automation rule's webhook fired against a conversation's stale triggering message under a race, sending the wrong message content — root-caused after an earlier pass had only gotten as far as "plausible."

A workflow's Find Records step aborted the entire run when a filter's variable resolved to a legitimate null — an optional relation simply not being set — instead of correctly matching zero records.

Manually removing a contact from a segment deleted the membership row outright instead of flagging it, so the next segment rebuild silently re-added the same contact the removal was meant to keep out.