'Time' and a 'value' properties cannot be deselected when editing animation keys in Curves section

Steps to reproduce:

1. Create and open a new project
2. Select Main Camera
3. Open Window -> Animation -> Animation
4. Create a new clip and add the Transform properties to it
5. Edit the Position transform in the Inspector and right-click
6. Create a keyframe anywhere in the Animation window
7. Change to the 'Curves' section in the Animation window
8. Right-click on any key and press "Edit Key..."
9. Click anywhere on any value (once, twice, or three times) to deselect it and observe 

Actual results: The whole value stays selected

Expected results: The value is deselected

Reproducible with versions: 2023.1.0a10, 6000.0.73f1, 6000.3.14f1, 6000.4.4f1, 6000.5.0b5, 6000.6.0a3

Not reproducible with versions:

Tested on (OS): Windows 11 Pro (25H2)

Notes:

• Both "time" and "value" are affected
• In 2023.2.0a1, only part of the values can be selected, not allowing a complete deselection, while in the latest versions, the value cannot even be partially selected