The fix for that is 3 posts above.
Basically you just have to add the proper spaces or remove them from the file. How to do this is explained above.
Enjoy!
Unfortunately, that quest is bugged. You should probably save before going in that area and then complete it on a separate save. It also hasn't been fully implemented yet, so you can't truly finish it.
There is also a second way that I got stuck in there that isn't truly stuck. If you are trying to leave there is a rune on the ground behind the blue flames. You have to click or interact with those to leave. This only works if you aren't bugged/glitched out after defeating the boss. If that is the case, you have to go back to an earlier save.