Taxonomy Advanced Not Saving

I appear to be having an issue with the taxonomy_advanced field not saving upon clicking publish on my custom post type. All other fields are saving correctly. It is retrieving all the correct categories but not saving.

array(
        'name'  => __( 'Blog Category', 'alphamedia-framework' ),
        'desc'  => 'Select a blog category to appear inside the shows page.',
        'id'    => '_show_post_category',
        'type'  => 'taxonomy_advanced',
        'taxonomy' => 'category',
        'field_type' => 'select',
 ),

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