I tried to use the add_new feature with a taxonomy select field and noticed that a new term is not populated into the proper field until the user saves the post.
Is this standard behavior?
It is problematic when you make this field required since the field does not populate when you try to add a new term and then you cannot save the post until the field is populated. The visitor is stuck without being able to save the post.
Can you test a taxonomy select field with the add_new parameter set to true and the entire field required?