Overlay Menu background either disappears or container expands when expanding or contracting foldouts

Steps to reproduce:

1. Open any Project
2. In Scene View click the tilde key to open the Overlays Menu
3. Open or close the master Unity foldout and do not move the cursor

Actual results: Overlay Menu background disappears for a split second or until cursor is moved

Expected results: Overlay Menu background stays consistent based on the current items in it

Reproducible with versions: 6000.5.0a5

Not reproducible with versions: 6000.0.66f1, 6000.3.5f1, 6000.4.0b4, 6000.5.0a4

Tested on (OS): Windows 11