Steps to reproduce:

1. Open a Unity Project
2. Ensure the Scene View is visible and that 'Cameras' is enabled
3. Duplicate the Main Camera by selecting it and clicking Ctrl + D
4. Open the Camera selector in the Camera Preview window
5. Observe that both cameras show up. This is expected behaviour
6. Rename the second camera's GameObject to the same name as the first one ('Main Camera')
7. Open the Camera selector in the Camera Preview window

Actual results: Only the first camera is available to select

Expected results: Both cameras are still available to select

Reproducible with versions: 7000.0.0a15, 6000.1.0b4, 6000.0.35f1, 2023.3.0a5

Not reproducible with versions: 2023.3.0a4, 2022.3.56f1

Can't test with versions: - 

Tested on (OS): Windows 11

Notes: 

• This is a regression, as prior to 2023.3.0a5, all cameras would show, even if they were named the same