Check on route create form/yaml, the Path field is set "/" by default, when create passthrough route, it prompts error about not supporting "spec.path", user needs to clear this field.
    

4.17.0-0.nightly-2024-09-13-193731
    

    1.Go to Networking->Routes page, click "Create Route", check the path field.
    2.Choose Passthrough type for insecure set and click "Create" button.
    3.
    

1. It has "/" set by default.
2. Error info shows up: 
Error "Invalid value: "/": passthrough termination does not support paths" for field "spec.path".
    

1. The field should be null by default.