CS2 crashes when selecting team or in-game using Ubuntu 22.04 + Flatpak

[zoltan-sule]

Your system information

• Steam client version (build number or date): Steam Runtime Version: steam-runtime_0.20240806.97925
  • Freedesktop SDK 23.08 (Flatpak runtime) (64 bit)
• Distribution (e.g. Ubuntu): Ubuntu 22.04
• Opted into Steam client beta? No
• Have you checked for system updates? Yes
• Steam Logs: [generate by running this command in a terminal tar -zcvf ~/Desktop/steam-logs.tar.gz ~/.steam/steam/logs]
• GPU: NVIDIA Corporation NVIDIA GeForce RTX 3060 Laptop (Driver Version: 4.6.0 NVIDIA 470.256.02) (OpenGL Version: 4.6)

Please describe your issue in as much detail as possible:

1. It should start a game and should not crash.
2. But instead it crashes when I click on a team.
3. If I am lucky and I can start a game then it has a high chance that it crashes in-game and then it starts validating the source taking precious time. Then I start it again but it doesn't offer me to join to the same game I was playing. If it crashes in-game again, then I have 2 not finished game with the fraction of the points that I could have made if it would not have crashed.

The crashes started after the upgrade and none of the fixes fixed it.

Steps for reproducing this issue:

1. start the game
2. join a lobby
3. click on a team -> 9 of 10 times it crashes
4. if it doesn't crash by joining a team it will crash in-game