How to reproduce:
1. Open the user's attached project
2. Go to File -> Build Settings -> Player Settings -> Other Settings
3. Set Api Compatibility Level to ".NET Standard 2.0"
4. Go back to File -> Build Settings
5. Enable "Server Build"
6. Build the project for Linux
7. Run the built .x86_64 file via the Terminal

Expected result: no errors are encountered
Actual result: "log4net:ERROR Exception while reading ConfigurationSettings. Check your .config file is well formed XML. <...>"

Reproducible with: 2020.3.4f1, 2020.3.33f1
Not reproducible with: 2019.4.38f1, 2020.3.3f1, 2021.3.1f1, 2022.1.0f1, 2022.2.0a11

Notes:
1. Other exceptions are encountered on non-reproducible versions (Exception: Magic number is wrong: 542)