Layout elements are missing when the VFX Graph Window is docked horizontally

Reproduction steps:
1. Open the attached “VFX.zip” project
2. Open the “graph” asset from the Project Window
3. Dock the “graph” Window to the bottom of the UI

Expected result: Floating panel is visible
Actual result: Floating panel disappears

Reproducible with: 2021.3.35f1, 2022.3.21f1, 2023.2.0a23, 2023.2.13f1
Not reproducible with: 2023.3.0b10
Fixed in: 2023.3.0a2

Reproducible on: Windows 11
Not reproducible on: no other environment tested

Note:

• The 2023.3.0a1 version does not exist therefore cannot be tested
• Reproducible on any new project
• Issue appears if the floating panel is placed in the bottom left corner
• Downgrading from versions where it worked correctly, would usually fix the issue