Compilation errors, only in the Editor log, after Reimporting the project when a prefab has a script in an Assembly Definition that has references to other Assembly Definitions

Reproduction steps:

1. Open "1130125" project
2. Select GO "A"
3. Notice it has a script from an Assembly Definition that has a reference to another Assembly Definition
4. "Reimport All"
5. Select GO "A"
6. Notice that the Script doesn't compile
7. Notice that there aren't any Compilation Errors
8. Open the Editor log and notice that all the Compilation errors are only written there

Expected Result: No compilation errors
Actual Result: Compilation errors, only in the Editor log, after Reimporting the project

Fixed in: 2019.2.0a10

Reproduced with: 2019.2.0a6, 2019.1.0b5, 2018.3.7f1, 2018.1.9f2, 2018.1.0f1, 2018.1.0b9
Did not reproduce on: 2018.1.0b6, 2018.1.0b5, 2018.1.0b1, 2018.1.0a1, 2017.4.21f1, 2017.3.0a1

Note:
Only reproduces with Prefabs