Trundle - Kit Breaking Bug

TL;DR - There is an issue when Trundle uses his Pillar of Ice on enemy champions standing in large stationary waves of their own minions. The champion becomes blocked from movement for the duration of the Pillar, essentially a 6 second snare.

Scenario: Ally minions are in greater number than enemy minions. Ally minions form an arc to deal damage. Ally champion is near the edge of the minion arc, just inside or just outside. Enemy Trundle can pillar on top of ally champion, sandwiching the ally champion between the pillar and the minion arc.

Result: The ally champion is unable to move for the duration of the pillar, and even beyond the animation of the pillar.

This looks to be due to terrain block on one side and minion block on the other causing complete immobility. This is essentially a 6 second snare. Even though this is caused by the interactions of working components (terrain and minion block), this cannot be considered an intended depth of play. I saw this consistently landed 3 times in game, it is not a fluke.

Unfortunately I do not have video, but I want to reiterate that movement is impossible during this scenario. I urge a hotfix for the issue, as it can essentially give a knowing Trundle free kills in lane.