Selecting Multiple Visual Elements in the Hierarchy with enabled Debug mode results in malformed Inspector window with thrown NotImplementedException and UnityEditor.GUIView:ProcessEvent Errors

Steps to reproduce:

1. Open the attached project
2. Open the SampleScene
3. Select multiple objects in the Hierarchy
4. Observe the Inspector and Console windows

Actual results: Inspector window is malformed, and errors are thrown in the Console

Expected results: Inspector window displays selected objects without visual artifacts and there are no warnings or errors in the Console

Reproducible with versions: 6000.3.0b3, 6000.3.7f1, 6000.4.0b7, 6000.5.0a6

Not reproducible with versions: 6000.0.66f2

Tested on (OS): Windows 11, macOS 26.2