Some folders inside 'kustom' get cleared after some restarts or when the storage gets temporarily full. Looks like automated cleaning process, or kwgt tries to recreate the folder structure
But only 'bitmap', 'font, 'icon' and 'komponets' get cleared (maybe cache also?)
I noticed that the default fonts are all recreated if I delete them, maybe this is the cleaning process that makes problems
Or maybe locate the 'kustom' folder inside storage//android/data, so miui & Samsung users can add this app/folder to the exceptions inside the rom built-in cleaner apps (which run automatically)
It's very sad to see all my files that I had created/found, sorted, labeled are now gone because I would have not thought that something like this would happen and therefore didn't created a backup..