Before version 1.3 of Form, the property "confirmMailBody" was available in the dialog /modules/form/dialogs/form/. Since Form 1.3, this property has been replaced by "confirmContentType".

Check the version handler of Form (delta 1.3), beacause there are other dialog properties removed.

The cleanup could be done within the migration process of Mgnl 4.5.

The logic could be:

• find all template T where dialog = "form:form"
• find all content where template is in T
• then update the properties