How to reproduce:
1. Open the user's attached "Spin_Splat_B.zip" project
2. Open the "SampleScene" Scene
3. Make sure the Probuilder tab is opened (Tools -> Probuilder -> Probuilder Window)
4. Make sure Edge Selection is selected in the Scene view
5. Make sure the front face of the "Arch" GameObject is visible in the Scene view
6. Select the "Arch" GameObject in the Hierarchy window
7. Select the 3rd edge to the right from the center of the Arch's face on the top (The whole edge is divided in 11)
8. Repeat step 7, but on the bottom, while holding CTRL key
9. Press "Connect Edges" in the Probuilder window
10. Repeat 7-9 steps but now on the 3rd edges to the left on both top and bottom of the Arch's face

Expected result: "Connected 1 Edges" notification is displayed when connecting the edges on the right side and on the left side of the Arch's face
Actual result: "Connected 0 Edges" notification is displayed when connecting edges on the left side of the Arch's face

Reproducible with: 3.0.0 (2018.4.25f1), 4.2.1 (2019.4.5f1), 4.3.1 (2020.1.0f1), 4.4.0-preview.1 (2020.2.0a18)