How to reproduce:
1. Open the attached “In-141841” project
2. Make sure Hierarchy v2 is enabled
3. Select “2 Players” scenario next to the play button
4. Enter Play mode
5. In Player 2 window, click on Layout and enable Hierarchy
6. Click Apply
7. Exit Play mode
8. Enter Play mode
9. Observe the Console in Player 2
Actual result: The Hierarchy is not open and warnings are thrown
Expected result: No warnings thrown and Hierarchy view is open in Player 2
Reproducible with: 1.5.0 (6000.3.0a2), 2.0.2 (6000.3.15f1, 6000.4.5f1, 6000.5.0b7), 3.0.0 (6000.6.0a4)
Couldn’t test with: 1.6.3 (6000.0.74f1) (new Hierarchy not available)
Reproducible on: macOS 26.4 (M1 Pro)
Not reproducible on: No other environment tested
Notes:
- The warnings are only thrown the first time the issue is reproduced
- Hierarchy will fail to open in Player 2 after reproducing the issue, toggling Hierarchy on and off in Layout will not fix the issue
- Does not reproduce when new Hierarchy is turned off