How to reproduce:
1. Open the attached "1299142" project
2. Open the "TestAddressableVersion" Scene
3. Enter Play Mode

Expected results: Console has no errors
Actual results: There are errors in the console

Reproducible with: 1.16.1, 1.16.15 (2019.4.16f1, 2020.1.17f1, 2020.2.0f1, 2021.1.0b1)
Not reproducible with: 1.15.1 (2019.4.16f1, 2020.1.17f1, 2020.2.0f1, 2021.1.0b1)
Could not test with: 2018.4.30f1 (Project has errors when opening, thus Package Manager is not available)

Note:
- Error thrown: Exception encountered in operation CompletedOperation, status=Failed, result= : Exception of type 'UnityEngine.AddressableAssets.InvalidKeyException' was thrown
- The Script attached to the GameObject has 3 lines of code, they are marked by comments above them. Having only 1st or 3rd line throws 2 errors. 2nd line by itself doesn't throw errors. 2nd and 3rd line throws 1 error. All 3 lines throw 3 errors