Edge Chromium PWAs
Hi again! You've helped me, and the program seems to work ok, but now, the last icon i applied to my PWAs is replyiing itself.

I have this issue as well. I am using a different chromium browser (vivaldi) but I have a non-browser version of this problem too. I have a few Microsoft Access applications that have this problem too.
In both cases, the shortcut target is calling a shared executable with some additional parameters that determine which program is actually opened.
Progressive Web App example:
%USERPROFILE%\AppData\Local\Vivaldi\Application\vivaldi_proxy.exe --profile-directory=Default --app-id=elldfnmogicegdcphgljaoaklkpcnbnn
Access Application example:
"C:\Program Files (x86)\Microsoft Office\root\Office16\MSACCESS.EXE" "C:\ProgramData\MicroMain\Maintenance\MMREPORT.accde" /Runtime
Tileiconifier appears to apply unique icons to shortcuts when I first set them but some time later (or after a restart) the icons will all be the same. I assume it is because the .exe is being used to uniquely identify the shortcut but not the full target.