Kindly go through the following Microsoft reference:
I have a Shell Extension which changes the overlay icons for folders and files in my app folder. It is created on my own. On Windows 10 it works as expected but on Windows 11 they are not shown/set. I don't know if this is a known issue, but I hope someone can help :)
After rewriting everything it works now. I have no idea what the problem was. Thank you for your help.