ROFL. I was like.. what creepers? I don't see any creepers. then... BURN THAT MINIMAP WITH FIRE FROM ORBIT!
Ok, I want to ensure people are understanding this. Monsters that glitch through walls cannot hurt you. Seriously. I've never ever seen that. When they glitch, it's a vanilla MC issue that affects all mobs in close quarters. When I'd setup a normal farm using MFR with breeders, the genetic (omg, what is wrong with my memory lately) the thing that separates parents/kids, the veterinary station and then grinder, I'd have a bunch of 3x3 pens connected to each other. That first pen would get so full that animals would glitch out and rubber band back in. The physical body is still in that pen, but they are trying to move around and MC is letting them pretend or what not, but they ALWAYS go back. I've seen skels clipping out of my spawn area when I forgot to check it and they'd look at me as they clipped, but never ever tried to shoot me. Creepers might explode, but they'll explode where they are not the clipped version (tho it might be close enough to do you harm still). Thus, creepers are still problematic, the code MAY allow them to think they are close to trigger, but it's not the same as them being able to phantomly go through walls and do whatever. If they are doing this now, it's a new thing and definately not normal. I've played ALOT of hours but not the same as everyone else here (I keep them away), so everyone's going to experience things differently. With that said, I highly doubt that they are learning new tricks like that.