due date stays empty in invoice mails

Hi, the $dueDate variable does not get filled in in my mails. In settings in preview I can see a date, however when I click on example, the date is empty. When I am about to send a mail the $dueDate is not shown either.

I m from Belgium and the language is dutch.

Any idea what might be wrong?

I’m not sure, in my tests the feature seems to be working correctly.

What do you mean by “when I click on example”?

https://imgur.com/a/4h4es

Here, the red circle is the “Example” button I was talking about, albeit in dutch.

Is the due date set when sending an actual invoice?