Plugin no longer saves settings in 5.5

Hi Everyone, I have a free plugin on the marketplace and a user reported that it’s no longer working in 5.5.
I verified that the issue is present, but I really can’t understand what’s causing it or what changed in the engine…

Apparently it’s no longer able to save the changes made to the DefaultEngine.ini file, when you restart the editor everything is gone, any idea on how to solve this? The source code is available on Fab and it should be decently commented.

Thanks in advance to everyone that is going to help!