Single Image Type Connection returns Array

Hi,

As the title states, when attempting to insert the connection the Single Image inside a default query of a posts module on a singular themer template:

[wpbb post:meta_box field='facts_image' image_size='thumbnail' date_format='']

The image does not display and instead returns : Array

Here is the field code I'm using, and I don't have a problem with any other connections (so far):

[
    'id'               => 'facts_image',
    'name'             => 'Fact Image',
    'label_description'=> 'Max file size for images ≤ 225KB',
    'type'             => 'single_image',
    'force_delete'     => false,
    'image_size'       => 'large',
    'columns'          => 6,
    'class'            => 'fact_featured_img',
    'tab'              => 'fact_media',
  ],

What am I missing?