I took a look at debug (F4), enabled "show paths" and "show path requests" and it shows how biters try to cross bodies of water insted of going around them. Fixed by disabling this mod. Hope you find a fix for it, hovercrafts are great, but that issue with the pathfinding made it not worth it.

This issue has been resolved through the game, but I have now also taken additional steps to resolved the issue with in the mod. Sorry for such a long delay in responding. I have been away from the game for a while.