[Gameplay] Enemy ward debris spawning sets off Nidalee's Bushwhack trap.
At the very very least, it appeared this way.
I was playing Support Nidalee. I can't recall who the teams were. I was either supporting Vayne versus Jinx and Shen... or I was supporting Ashe versus Tristana and Morgana.
I had thrown a trap (Nidalee's W) near the edge of the red/top side bush towards their tower (In bot lane). An enemy had a ward there, apparently. When their ward's timer ran out on my trap, the debris that spawned over it set off my trap (destroying it) and it said "Invulnerable" as a pop up text over it, I assume because ward debris doesn't take damage. Note that I did not destroy their ward, it's possible destroying a ward on my trap may have the same effect. But in this case, the timer on their ward simply ran out.
If it matters, I was using the Bewitching Nidalee skin, and I had 12/18/0 masteries with Thunderlord's decree as my keystone.
I did not try to replicate this (as it would likely be difficult to do so since it likely only does so with enemy wards, and since I can't see them, I can't really throw a trap on one and wait to watch if it pops it again), so it's entirely possible it wasn't as it appeared.
I had only recently laid that trap, so I'm almost 100% positive it didn't simply decay by itself and pop in a weird way.
I also am not aware if this is intentional, though, it seems like it shouldn't be given that it'd be inconvenient for Nidalee players. (And possibly other players since if it does this with Nidalee's traps, it may also do so with Caitlyn's or Teemo's. However, whether it does or doesn't with theirs, I have no idea. But it might, so if it's unintended to do so with Nidalee's, it may be worth checking other trap-setting champs to see if it happens to them as well.)