New projects with Editor versions that do not support Hierarchy V2 are opened without the Hierarchy window when the previous opened project had Hierarchy V2 enabled

Steps to reproduce:

1. Create a new Unity project using 6000.4.0a1 Editor version and Universal 3D template
2. Enable Hierarchy V2 (Unity > Settings > General > Use new Hierarchy window)
3. Close the Editor
4. Create a new Unity project with the Editor version that does not support Hierarchy V2
5. Observe the Editor

Actual results: No Hierarchy window is opened

Expected results: Old Hierarchy window is opened

Reproducible with versions: 6000.0.59f1, 6000.2.7f1

Can’t test with versions: 6000.3.0b4 (supports Hierarchy V2)

Tested on (OS): MacOS Silicon Sequoia 15.6.1

Notes:

• The user has to manually open the Hierarchy window or reset the Editor layout to default