Steps to reproduce:

1. Create a new Unity project using the Universal 3d template
2. Select any GameObject in the Hierarchy window
3. Click on the Tag in the Inspector window and click the "Add Tag..." button
4. Press the + button to add a new tag
5. Enter any name and press Enter on the keyboard
6. Repeat step 4
7. Enter the same identical name and press Enter on the keyboard
8. Observe the Tag popup window

Actual results: The tag popup window stretches out and is deformed

Expected results: The tag popup window looks the same 

Reproducible with versions: 6000.0.53f1, 6000.1.11f1, 6000.2.0b9, 6000.3.0a1

Could not test with: 6000.2.0b8 (feature was not yet introduced)

Tested on (OS): macOS Silicon Sequoia 15.5