3605357 - SUM phase MAIN_NEWBAS/XPRAS_AIMMRG error: Dispatcher Timeout

SUM phase MAIN_NEWBAS/XPRAS_AIMMRG fails with an error similar to the below:

Error in parallel XCLA execution Dispatcher Timeout: 'Split(s) pending' waited <000> sec for split        
 

Errors similar to the below are also seen in logs ->

CHK_POST_XPRAS_AIMMRG.LOG:

Exception raised at "CL_SHDB_PFW===================CP"

XPRASUPG.ELG:

Error in parallel XCLA execution
exit code           : "8"

DFKKSUM, Software Update Manager, S/4HANA , KBA , BC-DB-HDB-PFW , SAP HANA Parallelization Framework , HAN-LM-UPG-SAP , Upgrade of SAP Systems on HANA , Problem