How to reproduce:
1. Open the attached “IN-144458” project
2. Open the scene “SampleScene”
3. In the Hierarchy window, select the "New Sub Scene2" GameObject
4. In the Inspector window, press "Close" and "Open"
5. Observe the Console
Actual result: “System.InvalidOperationException: HashMap is full” error is thrown on each "Close" and "Open" operation
Expected result: No errors appear in the Console
Reproducible with: 6000.5.0a7, 6000.5.0b11, 6000.6.0a3
Not reproducible with: 1.2.0 (6000.0.0b11), 1.4.7 (6000.3.17f1), 6000.4.10f1, 6000.5.0a6, 6000.6.0a6
Fixed in: 6000.6.0a4 (77e2e2eea1be)
Reproducible on: Windows 11
Not reproducible on: No other environments tested
Note: For the issue to reproduce, the “New Hierarchy” has to be enabled