How to reproduce:
1. Open the “IN-155500” project
2. Open the "Assets/Scenes/SampleScene.unity" scene
3. In the Hierarchy, select the "Probuilder Cube" GameObject
4. In the Tools menu, change the Active Context to ProBuilder
5. Ensure the Hidden Element Selection option is not enabled
6. In the Scene view, drag the mouse over multiple vertices
7. Observe the Scene view
Actual result: The vertices the mouse is dragged over are not selected, and no other vertices are selected
Expected result: The vertices the mouse is dragged over are selected
Reproducible with: 6.1.0, 6.1.2 (6000.6.3f1, 6000.7.0b2)
Not reproducible with: 6.0.9 (6000.0.84f1)
Reproducible on: macOS 27.0 (M1 Max)
Not reproducible on: No other environments tested
Notes:
- This bug is not reproducible with the Hidden Element Selection option enabled
- The above description assumes Vertex Selection is enabled, but the bug is also reproducible when Edge Selection or Face Selection is enabled instead