The Korvara Jammer Caverns in Geladyne do not have an "edge" of the map in their battle maps, meaning you are unable to flee a battle at all, and must just eat a death (and the item/murai loss that come with it) just to leave if you get in over your head.
This isn't really a bug. Just a quirk of how the battle map is.
It felt kinda like an oversight more than anything due to the map being one of the smaller ones, so it leaned more toward a bug report than a suggestion...
But if it's something that can't be fixed, well... guess we gotta put a sign-out front that gives a warning-