“Save Search Query has failed.” warning is thrown and the Search is not saved when saving references in project with the default name

Steps to reproduce:

1. Create a new Unity project using the Universal 3D template
2. Right click any asset in the Project Browser and select "Find References In Project"
3. Click on the save button in the Search window and select "Save Project..."
4. Press the save button with the default name
5. Observe the Project Browser and the Console window

Actual results: The Search is not saved and "Save Search Query has failed. Filename has invalid characters." warning is thrown

Expected results: The Search is saved and no errors or warnings are thrown

Reproducible with versions: 6000.0.56f1, 6000.1.16f1, 6000.2.3f1, 6000.3.0a6

Tested on (OS): macOS Silicon Sequoia 15.6