Having a DoT on an enemy in Dungeons will remove these statuses on tic, really frustrating as it doesn't work that way anywhere else. It's resulted in me dying a number of times.
Update:
Seems to be an issue with specific skills.
Poison Arrow Shower - Scout
[PvM] Tornado Slash
I'll have to look if there's others. But it seems to be an issue specifically with unique skills.
Edited by Feuer, 01 October 2016 - 08:52 AM.