Double-opt-in email fields show ID not VALUES

Hi. When using Double-Opt-In “Customize Email template” there is a WYSIWYG editor that claims to be able to insert “Form Field” values…but sadly no substitution with the VALUES of the fields takes place. For example, “${b1-10}” appears as-is on the email, instead of the text value entered into the form field “b1-10”. Is this product in Beta? Has anyone really tested it?