Consecutive usage abilities and weaponry ( Blazing Bolts, Hell-Forged Warhammer maybe? ) are still losing their stacks if you use Vali Metabolic Accelerator.
Cyclones from Dark Agartha continue to last well after their animation has disappeared, which can sometimes lead to you getting knocked around by an invisible ability.
Feral Traian’s claw slash cone ability has a much larger cone than it appears to possess. You can stand outside of the chalk lines, on the sides of the boss, and still get hit with the ability/bleed.
Some pieces of terrain meant to block abilities in dungeons also block equipping gadgets that teleport you in the direction of the terrain. The best example I have can provide of this is the bridge fight with Dr. Klein; if you try to equip something that teleports you forward while near the fallen pillar which blocks Wave of Mutation, it will tell you that you’re “Unable to dodge in that direction.” This is also true when you try to equip the same gadgets next to areas that lead to falls.
Signet of Laceration has no buff icon above your health bar, but it is mentioned in combat logs.
Blast Crater ( Charged Blast’s passive ) reads as if it is supposed constantly reapply its slow if the target remains in the radius, sort of like the Elemental special abilities apply their effects. Instead, it will apply the DoT and snare once, and will only reapply the snare effect once the original snare effect has worn off, sometimes without reapplying the damage component. It also has no animation so you’re unable to tell where the zone of effect is, nor does the passive tell you how long it’s supposed to last.