Hello @Raahul2 ,

It's very unlikely that the upgrade has caused this. The upgrade process is supposed to skip any customized application files. Admins have to review those skipped files and decide if they want to keep the customized version,  revert to the OOTB version, or merge the customization into the OOTB file.

Have you checked if that "Update Set" you mentioned maybe contains Customer Updates related to these UI Actions? That would mean one of your admins reverted or merged them, either by accident or not.

Regards,

Robert