I know the iron bear grenade spawn anoint bug is a known issue, but i may have figured out what interaction causes it to occur.
It seems that exiting iron bear while the grenade spawned by iron bear is active causes the anoint to turn off for subsequent iron bear uses until the grenade is un-equipped then re-equipped.
When exiting iron bear when it is not active, the anointment seems to function as intended on the next iron bear deployment.
I have replicated this several times with a rain firestorm grenade with the anointment; if i see anything that disproves this theory, i will update.
I hope this helps to finally solve this problem (and that this is new information, and I’m not just wasting everyone’s time)