Foldout controls in UI documents are focusable when the "Focusable" property is set to false

How to reproduce:
1. Open the attached "foldout_focusable_issue" project
2. Open the "SampleScene" and enter Play mode
3. Select the top button in the Game view to focus on it
4. Navigate through the different UI elements with the Tab key
5. Observe the result

Expected result: The elements titled "Focusable = FALSE" are not focusable
Actual result: The Foldout control titled “Focusable = FALSE” is focusable

Reproducible in: 2021.3.37f1, 2022.3.23f1, 2023.2.17f1, 6000.0.0b14

Reproducible on: Windows 11
Not reproducible on: No other environments tested

Note: Reproducible in Player