How to reproduce:
1. Create a new project using the “3D Core” template
2. Add the Test Framework Package
3. Add “Exercise 7: Solution” sample from Test Framework Package
4. If the “CS0006: could not be found” error is logged then restart the Editor
5. Open Test Runner (Window > General)
6. Select the “Play Mode” section
7. Select the “VerifyApplicationPlaying” test and run it (right-click > Run)
8. Observe the build progress and the Console

Expected result: The Player is built successfully, tests are run, and no warnings are logged to the Console
Actual result: The Player builds indefinitely, “No script asset”, and “The referenced script (Unknown) on this Behaviour is missing!” warnings are logged

Reproduced with: 1.3.7 (2022.3.4f1)
Not reproduced with: 1.1.33 (2021.3.28f1, 2022.3.4f1, 2023.1.3f1, 2023.2.0a22), 1.3.5 (2022.3.4f1), 1.3.7 (2021.3.28f1, 2023.1.3f1, 2023.2.0a22), 2.0.1-pre.18 (2021.3.28f1, 2022.3.4f1)
Could not test with: 2.0.1-pre.18 (2023.1.3f1, 2023.2.0a22) (Package causes scripting errors)
Fixed in: 2.0.1-exp.1 (2022.3.4f1)

Reproduced on: macOS 13.3.1 (M1) (by reporter), Windows 11

Notes:
1. Samples are available from Test Framework version 1.3.2
2. The actual regression is in the Editor version but it could not be found due to inconsistent reproduction -> details are provided in the internal comments