Ticket #21290: 21290-6.diff

wp-includes/query.php

@@ -2216 +2216 @@
                 if ( $this->is_tax ) {
                         if ( empty($post_type) ) {
                                 $post_type = 'any';
+
+                                // do a fully inclusive search for registered post types of queried taxonomies
+                                $tax_post_types = array();
+                                $taxonomies = wp_list_pluck( $this->tax_query->queries, 'taxonomy' );
+                                foreach ( get_post_types( array( 'exclude_from_search' => false ) ) as $post_type ) {
+                                        $post_type_taxonomies = get_object_taxonomies( $post_type );
+                                        if ( array_intersect( $taxonomies, $post_type_taxonomies ) )
+                                                $tax_post_types[] = $post_type;
+                                }
+                                if ( $tax_post_types )
+                                        $post_type = $tax_post_types;
+
                                 $post_status_join = true;
                         } elseif ( in_array('attachment', (array) $post_type) ) {
                                 $post_status_join = true;