Thumbnail not displaying

ACF Pro – Version 5.3.8.1
ACF Recent Posts Widget – Version 4.5

Problem 1)
The ‘display thumbnail’ checkbox is not working. To be fair, however, I’m using ACF for the images attached to my post, but added

function acf_set_featured_image( $value, $post_id, $field  ){
    if($value != ''){
	    update_post_meta($post_id, '_thumbnail_id', $value);
    }
    return $value;
}
add_filter('acf/update_value/name=image', 'acf_set_featured_image', 10, 3);

to my functions.php file to get wordpress to recognize my custom post $image as my featured image. Facebook seems to recognize it, but the ACFRPW does not.

Problem 2)
Ok, no big deal, right? I’m using a custom field for my image so I’ll just include the shortcode [acf image] in the widget.

This results in ‘/wp-includes/images/media/default.png’ being added to each recent post, instead of the actual image being populated in the post by the $image field.

I have this set up actually working on another site that is not using ACF Pro. No clue why it would work there and not here.

http://rpg2016.wpengine.com/news

https://ww.wp.xz.cn/plugins/acf-recent-posts-widget/