Error "NullReferenceException: Object reference not set to an instance of an object" is present when opening the project or reloading the domain

Reproduction steps:
1. Open the attached project "ReproProj"
2. Observe the Console

Expected result: No Errors exist
Actual result: Error “NullReferenceException: Object reference not set to an instance of an object“ is present

Reproducible with: 6000.0.57f1, 6000.1.16f1, 6000.2.4f1, 6000.3.0a6

Testing environment: Windows 10 Enterprise 21H2
Not reproducible on: No other environment tested

Notes:

• Parameter 'json' supplied into the FromJson method is an empty string, thus the exception
• There is a Library folder, which is crucial for the reproduction (specifically Library/StateCache)

Workaround:

• Manual removal of the Library folder