How to reproduce:
1. Open the “AddressablesDemo.zip“ project
2. Navigate to the “Window > Asset Management > Addressables > Groups“
3. Expand the “Default Local Group (Default)“
4. In the Labels dropdown, enable all of the labels
5. In the Labels dropdown, press on the “Manage Labels …“
6. Double-click on any of the Labels / Long-press on the Lable and choose “Edit“
7. Type in a new Label name
8. Press the ‘Enter’ key on the keyboard

Expected result: The selected Label is renamed
Actual result: The selected Label stays, and a duplicate with a new name is created

Reproducible with: 2.4.2 (6000.0.43f1), 2.7.3 (6000.0.59f1, 6000.2.6f1, 6000.3.0b4, 6000.4.0a1)

Reproducible environment: macOS 15.7 (M4 Max), macOS 15.7 (M1 Max)
Not reproducible environment: No other environment tested

Error:
InvalidOperationException: Collection was modified; enumeration operation may not execute. System.Collections.Generic.List1+Enumerator[T].MoveNextRare ()