How to reproduce:
1. Open the “ProBuilder-6” project
2. Open the “SampleScene”
3. In the Hierarchy, select the “Cube” GameObject
4. In the Tools bar, click on Active Context: ProBuilder
5. In the Tools Settings bar, select Edge Selection
6. Right-click on any edge of the “Cube” GameObject
7. Observe the Context Menu

Expected result: “Remove Edges” option is usable
Actual result: “Remove Edges” is grayed out and disabled

Reproducible in: 6.0.1-6.0.4 (6000.0.42f1, 6000.1.0b10, 6000.2.0a6)

Reproducible on: Windows 10
Not reproducible on: No other environment tested