Data validation rules for Package Name are different between Package Creation and Edit views

Steps to reproduce:

1. Open the attached project
2. Open the Package Manager window
3. Click the + button and select the Create Package option
4. Set the Package name to "_test2"
5. Once the Package is created, click Manage -> Edit Manifest
6. Observe the Inspector window

Actual results: An Invalid Package Name error is shown in the Inspector window

Expected results:

• Technical name accepted in the package creator should not result in an error in the inspector window

Reproducible with versions: 6000.3.0a4

Can’t test with versions: 6000.3.0a2 or earlier (Feature was introduced in 6000.3.0a3)

Tested on (OS): macOS 15.5, Ubuntu 24