To restore icons on Windows 11, right-click on an empty area on your desktop, select View, and then click on the Show desktop icons option. Your icons will show up with immediate effect.

If accessing the "This PC" folder from File Explorer feels cumbersome, here's how you can move it directly to your desktop. To add the "This PC" icon to your Windows 11 desktop, follow these steps ...

Basically, the Desktop icon fonts are dynamic and change accordingly to the desktop background so that they are readable. Try this workaround and see if it helps. Open Settings > Personalization.