These are not converted because they come from the upload URI. We could convert them here but then on the output side we would need to convert them by adding a new tURI and then have the conversion function parse the URL and convert only the id inside it but I don't think that's needed.
These URIs already have the Comm keyserver hardcoded, so it will require even more changes anyway when we are adding multi keyserver support. And if in the future all uploads will be handled by blob service, this endpoint won't be even needed.