Ticket #52880: 52880.filter.patch

src/wp-content/themes/twentytwentyone/functions.php

@@ -338 +338 @@
                 // Add support for custom units.
                 // This was removed in WordPress 5.6 but is still required to properly support WP 5.5.
                 add_theme_support( 'custom-units' );
+
+                // Remove feed icon link from legacy RSS widget.
+                add_filter( 'rss_widget_feed_link', '__return_false' );
         }
 }
 add_action( 'after_setup_theme', 'twenty_twenty_one_setup' );