Particles Unlit Rendering Mode Subtractive gives empty Surface Type dropdown after the conversion

Steps to reproduce:

1. Download attached project and open in Unity.
2. In the Project Window, select the particleUnlit.mat material.
3. Make sure Rendering Mode is set to Subtractive.
4. Open the Render Pipeline Converter >> Window >> Rendering >> Render Pipeline Converter.
5. Scan and convert particleMaterial.mat material.
6. In the Project window, select the particleUnlit.mat material.
7. Observe empty Surface Type dropdown.

Actual results: Surface Type dropdown is empty after the conversion.

Expected results: Surface Type dropdown should not be empty after the conversion.

Reproducible with versions: 

6000.3.2f1; 6000.5.0a4;

Tested on (OS): 

MacBook Pro (16-inch, 2021), CPU: Apple M1 Max, Memory: 64 GB, macOS Tahoe: 26.1