Sapping Ritual fog covers non travelable terrain, making it impossible to know where you can move

Title says it all.

Easiest way I think there is to reproduce it is to load up a Steaming Springs map with rituals where the type is Sapping.

Then just find an area where a little pond is within the ritual circle, do the ritual, and just wait for one of the blue/purple fog clouds to cover up the pond. It's so opaque that you don't know you can't travel there (and why) unless you're running with the minimap overlay. And even then it can be confusing in the thick of it when you're trying to go through the fog to get away from a pack.