Reproduction steps:
1. Open the attached project "ReproProj"
2. Open the “/Assets/SampleScene.unity” Scene
3. Build and Run
4. In Player, hover over the Button with the text “Click me“
5. Observe another Button appearing below with the text “This is the tooltip“
6. Move the mouse off of the button

Expected result: The Button with the text “This is the tooltip“ does not disappear and remains in the Scene
Actual result: The Button with the text “This is the tooltip“ disappears

Reproducible with: 2023.1.0b9, 6000.0.21f1
Not reproducible with: 2021.3.44f1, 2022.3.48f1, 2023.1.0b8

Testing environment: Windows 10 Enterprise 21H2
Not reproducible on: No other environment tested