Reproduction steps:
1. Create a new 3D project
2. Click Edit > Project Settings > Player > Other Settings
3. Set Scripting Backend to IL2CPP
4. Click File > Build
5. Run the built Player
6. Open the Terminal and System Monitor
7. In the System Monitor, find the process of the Player
8. In the Terminal, enter ‘xkill’ command and click on the Player
9. Observe that the Player display is killed
10. The system Monitor still shows the Player process is alive

Expected result: The player process is killed
Actual result: The player process is still alive

Reproducible with: 2021.3.27f1, 2022.1.0a16
Fixed in: 2022.1.0b1

Reproducible on: Ubuntu 23.04, Ubuntu 22.10

Note: Does not reproduce with Mono builds