[Gameplay] Kalista capable of cancelling thresh lantern with passive

In a featured match I was spectating, there was a bug that occurred where Kalista goes and clicks on the lantern (you can see the particles for the lantern trail move back towards thresh) but for some reason her passive goes off and cancels the lantern movement.

No idea about how to reproduce this bug. May be related to movement priority based on kalista using her passive after picking up the lantern