Deadlock doesn't render on fullscreen in desktop mode (SteamOS beta)

[jan-xyz]

Your system information

• Steam client version:
• SteamOS version: 3.8.28
• Opted into Steam client beta?: Yes
• Opted into SteamOS beta?: Yes
• Have you checked for updates in Settings > System?: Yes

Please describe your issue in as much detail as possible:

Deadlock doesn't render when in game. The pause menu renders normally. It also works when using any resolution other than the native screen resolution. It also works normally in Discord streams, just locally it doesn't render anything.

Steps for reproducing this issue:

1. Install SteamOS 3.8.28 beta
2. Install Deadlock
3. Go to Desktop Mode
4. launch Deadlock