Trundle's Ice Pillar Vision modified

Did you guys remember the last time Trundle was nerfed. The chomp,q skill, cannot affect turrents anymore, and the ice pillar requires increasingly more mana instead of 80 mana. After a few days within that patch, I went and notice something drastically different. Before that nerfed patch, ice pillar revealed more vision than it does now. I am sorry that I don't have any proof. For example, putting a ice pillar in baron from red side, there is no vision at all. Also this happens when I put a ice pillar on the back of Dragon's pit. It's been a while, but did anyone catch this ninja nerf?

Please anyone?did you guys see it?