Still seeing the same problem with today’s patch. Logging out and logging back in seems to temporarily fix the issue. However, without fail the problem resurfaces and I’m only able to summon a single type of skeletal mage.
I’m having this same bug. sometimes I can get them to resummon a few times, but it seems like transitioning to a new area locks you out of summoning them again. I’m specced into both cryo and pyro, and after a bit I only summon normal ones.
Taking the Skeletons off your bar before you zone also works. Or you can take them off and portal then portal back. It’s less* interruptive than logging but bug still remains. I noticed it after I was able to summon more than 3 mages. Whichever mage has a 2 it stick on and if you have 5 it picks one of the doubled up mages. Key is to just have no mages when you zone in to the next area. then add them back and resummon.