Garen still doesnt get recognized for turret/inhibitor assists.
this is a weird bug that has existed for month, and ive seen it reported at least once.
when youre playing garen, and youre not specifically the one to take out the structure (even if you dealt damage to it), your contribution doesnt show up on the icons that pop up on the right hand of the screen when it falls.
might be happening with other champions aswell, but so far i only noticed it with garen.