NullReferenceException is thrown when comparing two default ObjectIdentifier values

Reproduction steps:
1. Open the attached “BugRepro” project
2. From the menu bar, select Repro > ObjectIdentifier default == default throws NRE
3. Observe the Console window

Actual result: NullReferenceExceptions are thrown
Expected result: No errors are thrown

Reproducible with: 6000.0.4f1, 6000.0.85f1, 6000.3.27f1, 6000.6.7f1, 6000.7.0b9, 7000.0.0a16
Not reproducible with: 6000.0.0f1, 6000.0.3f1

Reproducible on: Windows 11
Not reproducible on: No other environment tested