When I copy a URL with ViewParameters in Firefox. The Url will be UTF8 encoded. So the brackets are %28 and %29
E.g.: http://www.example.tld/site/(param)/value -> http://www.example.tld/site/%28param%29/value
The new stack can now not match the route and give it to the legacy. There it can be matched.
When I look in the code I see, that the rawurldecode function has been used only for the semanticPathinfo: