How to reproduce:
1. Open the attached project "OpenBug.zip"
2. In the Project window open the "NewUXMLTemplate.uxml" file
3. In the UI Builder window open the Project tab and expand "Assets"
4. Hover the cursor on the "NewUXMLTemplate1.uxml" file and press the "Open in the UI Builder" button
5. Observe the UI Builder window

Expected result: "NewUXMLTemplate1" is open
Actual result: "NewUXMLTemplate" is open

Reproducible with: 1.0.0 (2021.2.16f1, 2021.2.19f1, 2021.3.4f1, 2022.1.5f1, 2022.2.0a3)
Not reproducible with: 1.0.0-preview.18 (2019.4.40f1, 2020.3.36f1), 1.0.0 (2021.2.15f1, 2022.2.0a4, 2022.2.0a17)

Reproduced on: macOS 11.6 (Intel)

Note: Not reproducible if pressing right-click > "Open in UI Builder" in the 4th step