Do not search the image in insert

All this above I did and it did not work, I did not understand what you want? because using the type is CPT that works in the code I sent you, since the plugin does not work, you can simply test.

See how my CPT is done within the posts

https://prnt.sc/j7bgb7

Could you please provide a link ,from where we can download the custom post type ‘columnist’ you are using?
ie,the downloadable link to the plugin source code that make the columnist custom post type.

Thank you.

// Register Custom Taxonomy Columnists
function custom_taxonomy() {

	$labels = array(
		'name'                       => _x( 'Columnists', 'Taxonomy General Name', 'text_domain' ),
		'singular_name'              => _x( 'Columnist', 'Taxonomy Singular Name', 'text_domain' ),
		'menu_name'                  => __( 'Taxonomy', 'text_domain' ),
		'all_items'                  => __( 'All Items', 'text_domain' ),
		'parent_item'                => __( 'Parent Item', 'text_domain' ),
		'parent_item_colon'          => __( 'Parent Item:', 'text_domain' ),
		'new_item_name'              => __( 'New Item Name', 'text_domain' ),
		'add_new_item'               => __( 'Add New Item', 'text_domain' ),
		'edit_item'                  => __( 'Edit Item', 'text_domain' ),
		'update_item'                => __( 'Update Item', 'text_domain' ),
		'view_item'                  => __( 'View Item', 'text_domain' ),
		'separate_items_with_commas' => __( 'Separate items with commas', 'text_domain' ),
		'add_or_remove_items'        => __( 'Add or remove items', 'text_domain' ),
		'choose_from_most_used'      => __( 'Choose from the most used', 'text_domain' ),
		'popular_items'              => __( 'Popular Items', 'text_domain' ),
		'search_items'               => __( 'Search Items', 'text_domain' ),
		'not_found'                  => __( 'Not Found', 'text_domain' ),
		'no_terms'                   => __( 'No items', 'text_domain' ),
		'items_list'                 => __( 'Items list', 'text_domain' ),
		'items_list_navigation'      => __( 'Items list navigation', 'text_domain' ),
	);
	$args = array(
		'labels'                     => $labels,
		'hierarchical'               => false,
		'public'                     => true,
		'show_ui'                    => true,
		'show_admin_column'          => true,
		'show_in_nav_menus'          => true,
		'show_tagcloud'              => true,
	);
	register_taxonomy( 'columnist', array( 'post' ), $args );

}
add_action( 'init', 'custom_taxonomy', 0 );

Now I attached the image to this taxonomy see in the pictures
https://prnt.sc/j7bx2v

waiting for your position, because your return is once a day, this has taken more than 15 days, it’s complicated.

Are you using Advanced Custom Fields plugin for inserting image?

Yes

Advanced Custom Fields plugin doesn’t save the image when publish the post.
The image is not available when transition_post_status hook is called.
The code you provided won’t work when adding a new post,it only works or fetch the image on post edit. So you might ask the plugin developer to assist.
Or make the post as wordpress scheduled posts.
Hope this helps.
Thank you.

How to talk to you, if on the site you do not respond, by email do not respond. take a day to respond, then take the plugin out of the air.