Upper Guk Pathing
 

In upper guk at the live side zone line to lowerguk, everytime i summon a pet there and either run around that first corner, or send my pet to attack the mob standing right next to the zone, my pet will run through the wall and disappear. I'm not sure exactly where he goes, but i will quickly start hearing tons of frog aggro spam and an enormous train will trigger. This happens every time I summon a pet at that spot and try to walk simply walk around the corner.

Don't use guard, it can cause this issue.

there are also some mobs that are walking through walls. i think the pathing was screwed up in one of the last patches..

It happens anywhere, from shin lord to priest. try to have direct los on anything you pull