Target Champions Only bug.
The bug is not consistent across accounts. Some have it, some don't.
My Ephos account is fine while as my Thorn account with the exact same keybindings doesn't work at all with the function.
In fact it seems to entirely break the majority of my actions occasionally such as my right click.
Watch carefully on Ephos to see the exact intended behavior where I walk up to the wall/minion as close as possible but do not actually attack it.
You can see my keys being pressed in the lower left hand corner
I am using QiPress to show this.