Signup confirmation email %info token isn't replaced

I just got the following email when I signed up for an event in the Waterloo Region group:

Thanks deviantintegral@drupal.org for signing up for our event. You will be reminded 1 day before the event.

Troubleshooting performance issues on a slow web site
[Untimed]

%info

This might be a bug with signup itself, but I haven't seen such an issue on any of my own sites running Signup.