Thanks for your reply, we are updating the finish date for Projects via process and allocations end date got fixed for few projects.
If I have both RM and PM access, if I try to change the Project Finish date, system updates the allocations.
I understand the process is to fix allocations first and then Project Finis date after. It is unexpected to have allocations beyond Project Finish date as system doesn't allow you to allocate resources beyond Project finish date.
Ideally allocations end date should get updated as it happens when I tried it manually but via process we are having issues.