How to reproduce:
1. Use or create a new project
2. Switch to the android platform
3. Click Edit > Project Settings > Player > Android > Other Settings

Expected: no errors are thrown

Actual: error is thrown: "UnityException: GetBaseUnityDeveloperFolder can only be called from the main thread.
Constructors and field initializers will be executed from the loading thread when loading a scene.
Don't use this function in the constructor or field initializers, instead move initialization code to the Awake or Start function."

Tested and reproduced:
Version: 2021.2.0a14.1979
Revision: trunk 462ae11b66db
Built: Wed, 14 Apr 2021 20:17:34 GMT

Tested and didn't reproduce:
Version: 2021.2.0a13.1875
Revision: trunk 71a161db37e2
Built: Wed, 07 Apr 2021 13:59:57 GMT

Notes:
- Reproducible on Mac Editor