Reproduction steps:
1. Download and unzip the project that the customer attached
2. On CLI execute command <Unity installation> -projectPath <Path of the project> -executeMethod BuildCommand.BuildIOSDevelopment -buildTarget ios -logFile <Log file location> -batchmode -quit -nographics --gameVersion 1.0 --buildNumber 80
3. Wait

Expected result: Build completes and control is given over to application that launched the command (terminal for example)
Actual result: Build suceeds (system notification appears) however control is not given back, after 5 minutes "Timeout after 300 seconds while waiting async operations to finish. executeMethod 'BuildCommand.BuildIOSDevelopment'" is thrown

Reproducible with: 2020.3.6f1
Not reproducible with: 2020.3.13f1
Could not test with: 2018.4.36f1, 2019.4.29f1, 2021.1.15f1, 2021.2.0b4, 2022.1.0a2 (package, namespace errors)

Note: the repro scenario is not consistent. The customer mentioned that the issue always reproduces when using a CI setup. I could not reliably test this to find out the exact fix version, but the customer mentioned that the issue no longer occurs in 2020.3.13f1 for them