UI Toolkit Button doesn't revert its background color when the cursor is no longer hovering over the Button

Reproduction steps:

1. Open the attached “UITKTest.zip” project
2. Open the “/Assets/Scenes/SampleScene.unity” Scene
3. Enter the Play Mode
4. Hover over each Button

Expected result: The Button color changes to light grey when the cursor is over the button and reverts back to dark grey when it’s not
Actual result: The Button color doesn’t change or doesn’t revert back to dark grey after hovering

Reproducible with: 2021.3.15f1, 2022.1.24f1, 2022.2.1f1, 2023.1.0a23
Couldn’t test with: 2020.3.42f1 - UIDocument is not present in the stream

Reproducible on: Windows 10 (21H2)

Note: using 2021.3.15f1 and 2022.1.24f1 Editors the color doesn’t change at all when the cursor is over the Button