This has only happened to me once but it was weird enough to post. Today while battling the big enchilada node one of the goons just disappeared and as a result Thanos didn’t fire off his Courting Death. Also the usual visual bug set in and replaced the remaining goons with the next 3 set of enemies to fight.
Sorry this was meant for the bugs and technical issues board.
What was the rest of your team? Was Strange on it?