post_title and post_content empty after editing post with MB front end form

Hi,

I use a "MB frontend submission" form to edit a custom post type.
With this form I only want to edit some meta_fields registered in a meta_box.
So I don't want to edit the post_fields (post_title, post_content etc.).
My shortcode look like this:
[mb_frontend_form id="project-resources" post_id="8" edit="true"]

However when I submit this form on the front end, the post_fields (post_title and post_content) for the post that was edited are erased/emptied.

I was wondering if this is standard behaviour?
I thought it would be possible to have extensive control on what specific fields are edited where and when with "MB frontend submission".

Cheers and thank in advance.