Steps to reproduce:

1. Create a new Unity project using a 3D Universal Template
2. Open the Package Manager
3. Click the "+" icon
4. Select "Create Package..."
5. Enter around ~120 characters
6. Observe that no error/warning is shown
7. Click Create
8. In the Package Manager, select the created package
9. Click Manage > Edit Manifest
10. Select the package asset
11. In the Inspector, add an additional character to the "Name" value
12. Observe the bottom of the Inspector

Actual results: At the bottom of Inspector a "Invalid Package Name" error is shown, and no changes can be applied to the manifest without deleting characters

Expected results: The allowed character limit should be clearer, because the Package Manager allows a higher value, while the Inspector later on shows an error 

Reproducible with versions: 6000.3.3f1, 6000.4.0b3, 6000.5.0a4

Can’t test with versions: 6000.0.64f1 (no "Create Package..." option)

Tested on (OS): Windows 11

Notes:

• If around 200 characters are entered in the 5th step, the warning is shown and the package cannot be created, but the warning should be shown with 120 characters as well or handled better, because later on, adding even one character showcases the "Invalid Package Name" error. And while the error is shown, a new package with the same name can still be created through Package Manager