Unused separation line is used in the Prefab Context Menu when right clicking child Prefabs with the new Hierarchy Enabled

Steps to reproduce:

1. Create or open a URP Project
2. Go to Preferences > General and enable the "Use the new Hierarchy" flag
3. In a Scene's Hierarchy add the "UnityMaterialBall" Prefab from the URP Package
4. Right click the Prefab's child Game Objects
5. Hover over the "Prefab" context menu

Actual results: An unused separation line is present under the 2 context menu's options

Expected results: No separation line is used when there are no option groups to separate

Reproducible with versions: 6000.0.71f1, 6000.3.11f1, 6000.4.0b12, 6000.5.0a9

Windows 11 ONLY issue