Raven Ridge (2400G): garbled output with Dirt Rally (310560)

System information

• OS: Arch Linux
• GPU: 07:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Raven Ridge [Radeon Vega Series / Radeon Vega Mobile Series] [1002:15dd] (rev c6)
• Kernel version: Linux steam 5.11.1-arch1-1 #1 (closed) SMP PREEMPT Tue, 23 Feb 2021 14:05:30 +0000 x86_64 GNU/Linux
• Mesa version: OpenGL version string: 4.6 (Compatibility Profile) Mesa 21.1.0-devel (git-f67259d8)
• Desktop environment: i3-wm 4.19.2-1

Describe the issue

Basically, when I launch the game I see some garbage/corruption in the game launcher after fullscreening it.

This game is native and uses OpenGL, setting AMD_DEBUG=nodcc or nodisplaydcc gets rid of the issue.

Regression

Not sure, it seems to be reproducible with 20.3.4 and current mesa git.

How to reproduce

Run the game and fullscreen the launcher (it happens with i3, fluxbox and to some extent with openbox (using the apitrace below)). You should then notice the corruption.

Apitrace: DirtRally.trace.xz

Screenshots/video files (if applicable)