Your system information

• Steam client version (build number or date): latest beta and current stable
• Distribution (e.g. Ubuntu): ArchLinux
• Opted into Steam client beta?: [Yes/No] Yes
• Have you checked for system updates?: [Yes/No] Yes

Please describe your issue in as much detail as possible:

Using gamescope and starting a session with:
$ gamescope -e -- steam -gamepadui -steampal -steamdeck -steamos3

Games play normally but there has been a change in how Guide chords are handled. Used to take a screenshot with PS+R1 on a PS4 controller but not that makes a click like a mouse right button

Steps for reproducing this issue:

1. Start steamos session as described, connect a PS4 controller via Bluetooth.
2. Enter a game
3. Press PS+R1 to take a screenshot
4. The game will register a right mouse click