Reproduction steps:
1. Create a new 3D project
2. Open the Terminal
3. Enter this command: ps aux | grep 2021.3.14f1 | grep -v grep | awk '{print $2}'
4. Enter this command: kill <first PID from the results of the previous command>

Expected result: Unity Editor is killed
Actual result: Unity Editor is still open

Reproducible with: 2020.3.44f1, 2021.3.17f1, 2022.2.4f1, 2023.1.0b1

Reproducible on: Ubuntu 20.04