This behavior is modified to stop removing permission objects during startup in these versions of vCenter Server:
Note: This change only impacts the startup behavior of vCenter Server. A validation check of all permission objects still occur every 24 hours and vCenter Server removes any permission objects in which a user or group is not found.
To resolve this issue, restore vCenter Server permissions from a previous backup of the vCenter Server Database.
Notes:
To restore vCenter Server permission from a previous backup of the vCenter Server database: