Troops can't retreat at snowy battlemap. [2.0, publ]

[Moose]

Public 2.0 release. No cheats or anything.

This happened after I joined the fight (100v200) near The Wall. Retreating troops didn't disappear at the edge of the map, jumped back as if something was pushing them. The map was snowy, had no trees and medium hills.

Screens.
https://imgur.com/a/dwA0u