Under the hood
Useful2 Signal2
API error codes now survive being stored and reappear in failure records.
What's wrong with this entry?
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What
An assistant message's API error code now survives deserialisation as apiError, is passed along by the failure-marking helper into the API-failure record, and a new error branch produces it for one specific error constant with a matching log line. Unconditional.
Evidence
...(t.api_error !== void 0 && { apiError: t.api_error })
Strings lifted out of the shipped bundle, so the claim above can be checked against them.