":focus" style will not be shown when the UI element is unparented and reparented and the "Focus()" method is called without the "Blur()" method being called

How to reproduce:
1. Open the “UiToolkitLayout.zip“ project
2. Open the “SampleScene“
3. Enter Play Mode
4. Press the Space key on the keyboard multiple times
5. Observe the Button in the Game view

Expected result: The button has a red background
Actual result: The button has a gray background

Reproducible in: 2022.3.58f1, 6000.0.37f1, 6000.1.0b5, 6000.2.0a3

Reproduced on: Windows 11 Pro (23H2)
Not reproduced on: No other environment tested

Notes:

• If “Blur()“ method is called before the “Focus()” method, pressing Space will yield expected results
• If the element is not unparented then reparented, pressing Space will yield the expected results
• The element is still considered the “focused“ element, but it’s just not visualized through the “:focus“ style
• Even when clicked manually, the button will not become red