Reproduction steps:
1. Open the attached project "FailedToLoadPackage.zip";
2. Observe the console.

Actual results: The exception is thrown in the console:
"FileNotFoundException: Could not load file or assembly 'Cinemachine, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies."

Reproduced on: 2018.1.0a1, 2018.1.4f1, 2018.2.0b7, 2018.3.0a1.
Not reproduced on: 2017.4.5f1 or lower.

Note: on 2017.x versions, the project also has some exceptions, but they are not related to this issue. The issue reproduces only on 2018.x versions.