Guild Wars 2

1: if you get immobilized while moving, you cant use any skills. (Ex: auto attack won’t work when immobilized, this won’t happen every time, but really often)
2: For warrior, when you use an aoe targeted burst, and you get an extra bar of adrenaline, it causes it to disappear, forcing you to activate it 1-3 times before being able to use it.
3: if you’re in point blank range of your target with a ranged weapon, you can’t use any weapon skills.
4: If you jump at the same time as a ranger using entangle, you’ll be stuck in the air unable to do anything other than die.
Edit: just found a #5, 5: if you are moving while dazed, you auto walk regardless of if you have it toggled. keep in mind all of these don’t occur 24/7 and only occur about 30% of the time. (except the aoe burst one)
more found:
6: if you shoot combustive shot, it occasionally disappears in the ground.
7: if you throw things like impale or throw axe in point blank range, it disappears.
8: ranged weps would often get obstructed when shooting at the target (no things in the way)
9: if you use movement skills like bull’s charge or rush, it sometimes makes you go backwards, regardless if you are holding forward or not.
10: you will sometimes charge into the enemy with skills like above and then either hit the opposite way, or get stuck moving and end up not hitting at all.
11:block skills with short duration like counterblow will often go into cooldown without blocking or activating at all.
12: if you dodge while using whirling axe, it wastes an endurance bar, and the dodge won’t work.