How to reproduce:
1. Open the attached “IN-140038_build” project
2. Open the “SampleScene” scene
3. Navigate to Tools → ProBuilder → Editors → Open UV Editor
4. In the Hierarchy window, select the “Stairs” GameObject
5. In the Scene view, change the used Tool Context to “ProBuilder”
6. In the UV Editor window, click on one face, and then click on another face
7. Notice how only one face is selected
8. In the Scene view, make sure that you are using the “Game Object” Tool Context
9. In the UV Editor window, click on one face, and then click on another face
10. Observe the UV Editor
Actual result: Both of the clicked-on faces are selected
Expected result: The UV Editor continues to use the “ProBuilder” ToolContext, and only one face is selected
Reproducible with: 6.0.1 (6000.0.73f1), 6.0.9 (6000.0.73f1, 6000.6.0a3)
Could not test with: 5.0.1 (6000.0.73f1, 6000.6.0a3) (Due to a deprecated feature and different way to open the UV Editor)
Reproducible on: Windows 11
Not reproducible on: No other environments tested
Note: The UV Editor, being a feature that comes with the ProBuilder package, should always use the ProBuilder Tool Context