Taxonomy Featured Image not working

Featured image in taxonomy add/edit was not showing. After investigation, it was because the function get_taxonomies (class-archive-control.php:325) is called within the init hook.

Adjusting the priority fixed this problem :

class-archive-control.php:77
--- add_action( 'init', array( $this, 'archive_control_handle_taxonomy_fields' ) );
+++ add_action( 'init', array( $this, 'archive_control_handle_taxonomy_fields' ), 999 );

Then another problem, taxonomies images was not showing on the front-end category page, but only the archive image.

Fixed with :

class-archive-control.php:77
--- if (is_post_type_archive()) {
---	$post_type_slug = get_query_var('post_type', null);
--- }
--- if (is_tax() || is_category() || is_tag()) {
---	$term = get_queried_object();
---	$term_id = $term->term_id;
--- }

+++ if (is_tax() || is_category() || is_tag()) {
+++	$term = get_queried_object();
+++	$term_id = $term->term_id;
+++ } else if (is_post_type_archive()) {
+++	$post_type_slug = get_query_var('post_type', null);
+++ }

Topic made to help others and the creator of this plugin.

Thanks for this useful plugin, I hope you will merge this patch in your next release.