Sometimes when going into the nether (not all of the time, but it happens a lot) my friends and I will get hit by something that we can't see, not even in spectator mode. The death messages vary as well, it has said slain by spider and slain by creeper (note that it said slain by creeper, not blown up) and shot by skeleton, even though in all of the deaths, when the player is getting hit, arrows are stuck in them as if they were shot, even when it says slain by spider or creeper.
Video for reference: https://www.youtube.com/watch?v=ewoF0fgplkE&feature=youtu.be
Linked issues
Comments 3
Did you even read or watch the video? It's not a creeper or spider in the nether, that's what the death message says. It says you're killed by a spider when you're being hit by arrows, same goes with the creeper. Also it is completely invisible, not even visible in spectator mode.
There are no natural occuring creepers & spiders in the nether.