In Wvw the other night not all of the world object loaded in for me after waypointing. I was able to walk in and out of where a wall was suppose to be, and also target enemy players while my team was sieging a gate. There was no collision at all. it was as if I alone could see the hole and walk in and out of it.
Sorry I know this is the worse bug report ever and I should have reported it when it was fresh in my mind but I hope it still helps.
I wanted to add that it was not repeatable for me. It only happened that one time and I didn’t attempt to duplicate it.