This stupid bugs been around since his re-release and it's really annoying that it's still a thing. Also the fact that it can be destroyed by a single turret shot regardless of its rank makes me wonder why I try to use it at all in a dive sometimes.
It should only proc aggro if they hit the edges due to it being a knockup. Never seen just placing it proc aggro.
Want to say it works the same way as Trundle pillar doing 1 true damage to ensure that you get the assist for using the ability, not sure if it is a bug though.
Don't believe this to be a bug. Other replies in this thread are correct to my knowledge.
Anivia's Wall works the same. Deals 1 true damage if you hit them with it.
All terrain deals 1 damage on cast to anyone hit by it.
They coded it awhile back to actually apply something so that the damage and cc-less ability actually grants assists.
Maybe They forgot an aggro check
Just like Janna ult, it deals 1 true damage so you get an assist.
If you caged someone, your team killed him and you didn't get an assist, you'd be right here complaining about that.
It works the same as.
Taliyah R.
Trundle E.
Veigar E.
Ornn Pillar.
Anivia W.
They all proc turret aggro and deal 1 true damage.
it takes turret aggro if they get displaced by the wall
its because it deal 1 true damage . Its the same for trundle pillar or anivia wall .
Anivia's wall does that. All they have to do is walk into it and boom aggro. It'll also pop a spellthief AND a mana band charge.
Maybe it's like Trundle e and does 1 true damage
have the same interaction when they build terrain on a enemy champion under tower.
Darius grab doesn't so yeah I agree it whould be changed
Note to community:
FIddlesticks can fear and not grab turret aggro.
You're welcome.
Also, 10/10 would fear under turret again. 
Anything that displaces does damage. I've killed someone with trundle E.
