apicurio-studio: can't add path have PathParameter

i used OpenAPI3.

i wanted to add this API path, /{paramA},{paramB}/{filename}.{extension} but dialog say “Enter a valid Path”(red bold), and can’t click add button.

i would tried to other pattern, /{paramA} -> OK /{paramA}/{paramB} -> OK /filename.{extension} -> OK /{paramA},{paramB} -> NG /{filename}.{extension} -> NG

swagger editor does not error those path.

Is it a restrict of apicurio studio? Will apicurio support those paths?