Some of the minions do not spawn by default. E.g. C’Thun equipment, that spawns a minnion.
You have to force close the client and start again.
Minnions spawn via ability, but not always. Naga equipment to spawn two Royal Guards spawn them, Legion equipment to spawn two infernals, does not, they stay invisible.
It’s quite annoying to do every combat.
There are more mercs like that, but C’Thun comes to mind.
Could somebody look into it? It’s been prelevant for at least a month.