Problem: because of an unkown reason all my desktop files and folders were hidden. i managed do unhide all folders, but i can't unhide the files

i tried to unhide the files via terminal `chflags nohidden filename` but it doesn't work. i also checked if the hidden flag is placed, but there is no hidden flag on the files (but they aren't visible). here is the output via terminalcommand `ls -lo`:

`-rw-r--r--@ 1 username 13669 19 Aug 11:54 filename.txt`

i also tried an app called InvisibliX (which isn't under development anymore), with no success
and of course i used the searching function, which lead me to this: [How to unhide files on Mac?](https://apple.stackexchange.com/questions/309450/how-to-unhide-files-on-mac) with no further success

I'm thankful for every hint you may have for me!

Some additional information regarding the OS:
Mac OS X Catalina 10.15.6