There's a bug in front of Illfang's Tower. It happens when the cousin of Vagabond (the kobold) leaves after talking with MC.
It's the same void that appears after losing the battle at Mermaid's Song, in which you can walk, use the menu, and even enter fights, but completely blind in map.
Edit: Uh. This happened in Version 2.2, I just saw the new Version 2.3. :(