Reproduction steps:
1. Open user's project "AddressablesEditingGroups.zip"
2. In the top toolbar select Window/Asset Management/Addressables/Groups
3. In the newly opened Addressables Groups window right-click on "MyGroup 123" and select the "Rename" option
4. Delete "123" and press the Esc button on the keyboard

Expected result: Group's name reverts to the previous name "MyGroup 123", meaning that the changes weren't applied because the Esc button was pressed
Actual result: Group's name changes to "MyGroup", meaning that the changes were applied even though the Esc button was pressed

Reproducible with: 1.16.19 (2018.4.36f1), 1.18.4 (2019.4.28f1, 2020.3.13f1, 2021.1.12f1), 1.18.9 (2021.2.0b1)