LoS issues with Grasping Darkness
It had this problem since they first released it for testing, but this round some of it has been fixed. You’ll still find a few places, especially areas like Verdant Brink with really uneven ground, where it still acts up. It is better, just not quite there yet.
Edit: Oh and don’t count areas in WvW, the terrain, especially in and around camps for some reason, has been super buggy even for arrows with clear LoS, so don’t use that place as a frame of reference either.