Temple enemies not activating

Yeah I have the same bug pretty regularly. I always respawn at checkpoint and that fixes it but sometimes the checkpoints are like 10+ rooms back. Good to have a simpler fix, thanks!

Its not a bug, just an unintended interaction. You gain a stealth mod from a rare you killed. If you have empty skill slots, try using some sort of summon that can be attacked, maybe it will trigger them to wake up.