user.community.lang.tags.comment_line defines comment <user_text>, which means when you say "comment line" while using cursor less, it will always add a new comment marker instead of toggling the current one, even if the current line is already commented.
see https://app.slack.com/client/T7FPSMV8F/C026KPTJE6T for more detail. Not sure what to do about it at this stage.