Hi Stephen
I can confirm that this doesn't work using a multiselect field type - when I made the field a text field this displayed in the notification Correction this does work when you add data into the multi select field.
Note this field is per session rather than a per user field - if yiou want to record the user's diet requirements then you want a custom field in the sign-up note
The face to Face was extensively redesigned in version 9 with additional place holders and custom fields being available.
regards