When renaming UI Toolkit Elements in UI/main stage, names start with # which is not parsed

Unity: UI Toolkit Framework

This issue has been closed as a duplicate of:

6.7.X

6.6.X

Steps to reproduce:

Create and open a new project
In Hierarchy, 'Right-click -> UI Toolkit -> Standard Elements -> Visual Element'
Press F2 to rename the Visual Element
Name it to "Hi"
Press F2 to rename it again
Press the right-arrow to append to the existing name (will display '#Hi')
Append "1" to the name and press Enter (should be '#Hi1')
Observe the Hierarchy

Actual results: The Visual Element is named '#Hi'

Expected results: The Visual Element is named '#Hi1' or a warning is thrown and is named '#Hi'

Reproducible with versions: 6000.6.0b1, 6000.6.1f1, 6000.7.0a6

Can’t test with versions: 6000.0.82f1, 6000.3.23f1, 6000.5.11f1, 6000.6.0a7 (No UI stage in Hierarchy)

Tested on (OS): Windows 11 Pro (25H2)

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