[bug] SteamOS Main and SteamOS Preview have artifacting when toggling between the Mangohud performance overlays

[matte-schwartz]

Your system information

• Steam client version: both Stable and Beta clients tested
• SteamOS version: 3.6 and 3.7
• Opted into Steam client beta?: [Yes/No] : yes
• Opted into SteamOS beta?: [Yes/No] : yes, SteamOS Main (and SteamOS Beta)
• Have you checked for updates in Settings > System?: [Yes/No] yes

Please describe your issue in as much detail as possible:

When toggling between the various preset performance overlays for Mangohud within gamescope-session, there is around a ~75% chance of there being some display artifacts during the transition between the overlays.

Steps for reproducing this issue:

1. load into gamescope-session
2. toggle the performance overlay between the various options a few times
3. you should notice the artifacts pretty quickly