Would be great if anyone found a solution for this.
Exactly what i was looking for all day 🙂
This really should up highlighted somehow.
The URL does not change, the page refreshes (stays on the same URL) but the page becomes blank, without having any errors on it.

For some reason I can’t get this to work, The page is getting created, but I get redirected to a blank page, my current Front End page looks like:
<?php
$args = array(
'post_id' => 'new_1',
'field_groups' => array( 357 ),
'submit_value' => 'Submit Story',
'return' => '%post_url%?foo=bar'
);
acf_form( $args );
?>
And My Functions File:
//ACF FORM ARGUMENT
function my_pre_save_post( $post_id )
{
// check if this is to be a new post
if( $post_id != 'new_1' )
{
return $post_id;
}
// Create a new post
$post = array(
'post_status' => 'publish' ,
'post_title' => $_POST['fields']['field_54f5894e01b06'],
'post_content' => $_POST['fields']['field_54f5897401b07'],
'post_type' => 'shortstory',
'post_parent' => $_POST['fields']['field_54f596ac44e2b']
);
// insert the post
$post_id = wp_insert_post( $post );
// update $_POST['return']
$_POST['return'] = add_query_arg( array('post_id' => $post_id), $_POST['return'] );
return $post_id;
}
add_filter('acf/pre_save_post' , 'my_pre_save_post' );
Any help would be much appreciated.