update 2.1 comes out Wednesday
>Arowana Mall: Adjusted terrain in one place to prevent squids from going through, all modes
i think i know what they're talking about

basically, if an opponent's splash wall is close to the wall by the out of bounds area on the B corridors and you try to swim (maybe walk) by the splash wall on that side, the wall can push you out the map.
it happened to me forever ago, i was going to swim by the splash wall on a small strip of my own ink to get behind an enemy, but the wall just shoved me out.