There was some hitbox stuff bugging out recently I remember Boors I think mentioning, maybe Yorick, the inherently buggy creature he's always been, got in on that?
EDIT: Here's the post from Riot Boourns, "Hey guys, I think I identified what was going on with this. The BotRK post[1] from last week rang some alarm bells for me. What happened was that the pixel perfect targeting part of the code was broken so the targeting system was making decisions based only on the bounding volume around models.
How this manifests is that when you have targetable objects near each other (like Taric near a tower, or minions packed in a wave) you will get imprecise targeting even though your mouse is over the model of the thing you're trying to target.
I just checked in a fix and it's going through the QA process.
Thanks to all of you for raising awareness on this. I'd been thinking that something felt "off", but I thought I was just a baddie or had intermittent lag. Your comments helped narrow things down. This video is really helpful for providing a solid test case for us."