ShowDebugInfo won't change even if I set it to true through the In-Game GUI. When I refresh using the Refresh Debug button, it won't do anything. If you get back to the GUI's main menu and then return back again, you will see the changes aren't saved. In addition to it, trying to click the Reload or Apply All Changes buttons will crash the game since, in the debug config, it will remove the quote marks inside the brackets right after the blocked mod list.

I cant reproduce the Refresh Debug issue

Probably fixed in 6.0