Ticket #47623: 47623.diff

wp-includes/feed.php

@@ -662 +662 @@
         // Extract the post modified times from the posts.
         $modified_times = wp_list_pluck( $wp_query->posts, 'post_modified_gmt' );
 
+        $modified_times = array_merge( $modified_times, wp_list_pluck( $wp_query->posts, 'post_date_gmt' ) );
+
         // If this is a comment feed, check those objects too.
         if ( $wp_query->is_comment_feed() && $wp_query->comment_count ) {
                 // Extract the comment modified times from the comments.