How to reproduce:
1. Download the user-submitted project (PackageModStausADBv2.zip)
2. Before opening, check that the Packages/manifest.json file does not contain "com.unity.modules.cloth": "1.0.0"
3. Open the project, see the Package Manager built-in modules that Cloth is disabled
4. Check the Console window/enter the Play Mode in SampleScene

Expected result: Test.cs script throws errors due to disabled Cloth module, Play Mode cannot be entered
Actual result: no errors are thrown, Play Mode can be entered and Cloth still works

Reproducible with: 2018.4.23f1, 2019.4.1f1, 2020.1.0a21
Not reproducible with: 2020.1.0a22, 2020.1.0b13, 2020.2.0a15

Notes:
2018.4 reproduces the issue with ADBV1, but reimporting the script starts displaying the errors
2019.3 and newer do not reproduce the issue with ADBV1; with ADBV2 the scripts still do not start displaying errors when reimported