Steps to reproduce:
1. Open the attached project “NullTable“
2. Navigate to Window > Asset Management > Addressables > Groups
3. In the Addressables Groups window click Build > New Build > Default Build Script
4. Make sure that Play Mode Script is set to Use Existing Build (Windows)
5. Enter Play Mode
6. Observe the Console window

Expected result: No error messages appear in the Console window
Actual result: An “AssertionException: Assertion failure. Value was Null“ error message appears

Reproducible with: 1.3.2, 1.4.0-exp.1, 1.4.2 (2021.3.16f1)
Not reproducible with: 1.3.2, 1.4.0-exp.1, 1.4.2 (2022.1.24f1, 2022.2.2f1, 2023.1.0a25)
Couldn’t test with: 2020.3.43f1 (couldn’t resolve the “The type or namespace name 'PrefabStage' does not exist in the namespace 'UnityEditor.SceneManagement'“ error)

Reproducible on: Windows 10