Resolved -
Latest QStash release caused some Workflow runs to fail due to a bug in Workflow URL detection mechanism.
Affected workflows did not start at all and moved directly to DLQ. These workflow runs, which show "detected non-workflow destination" message in the response body, can be retried from DLQ.
This was a partial failure, lasted from 10:10 to 11:00 UTC, not all users' workflows were affected.
Feb 6, 10:10 UTC