Hidden question not rendered in form, not sent in notification

I have a hidden question that was working correctly until recently, but now it is not being sent with the notifications to my app that depends on it.

When I review the form I do not see the hidden field in the source code. It appears not to be rendered at all.

Please help!

@squarestar I appreciate your patience. If you are passing in the hidden field to the booking form ?source=linkedIn as an example, then we will record information in the form and the bookings. Are you seeing the hidden field within the booking details in your bookings dashboard?