Your system information

• Steam client version (build number or date): Jul 20 2021
• Distribution (e.g. Ubuntu): Manjaro/Arch
• Opted into Steam client beta?: No
• Have you checked for system updates?: Yes

Please describe your issue in as much detail as possible:

When moving a Proton game for a different hard drive, the equivalent prefix and shader cache folders are not being moved.

Steps for reproducing this issue:

1. Move an installed Proton game to a different hard drive
2. Check if the equivalent shader cache and prefix folders were moved as well