The Post to WIP job fails when it is triggered from a step within a process. The following error is seen in the process.
BPM-0531: The job invoked from the step has failed.
The job works without issues when triggered independently.
This issue was not reproducible on Patch 3 of version 15.9.3. There was no direct relationship with a defect/issue that this behaviour was mapped to, in the base version of 15.9.3.