To reproduce:
1. Create a new project
2. Add ProBuilder package from Package Manager window
3. Create a ProBuilder object (a cube, ark, etc..) in the scene
4. Make the object a prefab
5. Build the project

Expected: no error, build succeeds
Actual: build succeeds but getting "Destroying assets is not permitted to avoid data loss." errors in the console

Versions reproduced on:
2021.1.0f1, 2021.1.1f1

Version not reproduced on:
2021.1.0b12

Notes:
- Having build tests, the error makes them fail
- Tested on macOS 11.1