Rare monster minions not dying after corresponding rare has died

So, I just faced an odd situation, POE2's version of beyond demons that spawn in corrupted areas when you kill lots of stuff spawned a rare? and 3 minions with the 3 minions reviving every time they are killed. Now, I'm not 100% sure a rare spawned with them but I assume it must have because the minions did.

Anyway, I killed everything in the area, but the reviving minions just kept reviving and chasing me. I went back, double checked everywhere assuming I'd somehow missed the rare and still I couldn't find any rare to kill to stop the stupid annoying minions respawning every few seconds. Ended up 'exploring' into an abyss area being chased by these stupid reviving minions and then getting trapped and dying (in a 1 life map) all because of these stupid, infuriating reviving minions WITH NO RARE to belong to.

After I died I did /bug and got 185,108,308.