A Serious Terrain Issue

On the Incursion map of Echelon, there is a rare terrain glitch where ally minions going on the left side of the first divided section are unable to get past the stairs. They move around from side to side but are unable to go forward. Even after they’re destroyed, the next wave will do the same thing. I have only seen this once so far, however it seems like it could be a repeating issue in the future.