Jobs activated within a JOBG does not adhere to the FIFO method which causes issues while using JOBG to control the execution sequences.
Release : 12.3.9
Component: Automation Engine
This happens when the object in the JOBG does not have Generate at runtime set - This results in FIFO-NR not being set.
Use Generate-at-runtime on the task to be queued within a JOBG.
This is identified as a bug and will be fixed in a future release of 21.0