Required resource field is not detected by channel editor

Reproduction path:

• add a resource field to a document type and make it required
• create a new document in the editor in the channel manager
• result: you can create and save the document
• expected: you are warned about required unknown fields and cannot save the document

Side note: in the wicket editor the label of the field does not get a * behind it, but the validation works: you cannot save the document if there is no value present.