diff --git a/wp-includes/version.php b/wp-includes/version.php
index 7c58d52fad..21232c649e 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.4-alpha-56511';
+$wp_version = '6.4-alpha-56512';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.
diff --git a/wp-includes/widgets/class-wp-widget-media-gallery.php b/wp-includes/widgets/class-wp-widget-media-gallery.php
index 40cc5c2ba4..ecc446c221 100644
--- a/wp-includes/widgets/class-wp-widget-media-gallery.php
+++ b/wp-includes/widgets/class-wp-widget-media-gallery.php
@@ -248,6 +248,8 @@ class WP_Widget_Media_Gallery extends WP_Widget_Media {
 	protected function has_content( $instance ) {
 		if ( ! empty( $instance['ids'] ) ) {
 			$attachments = wp_parse_id_list( $instance['ids'] );
+			// Prime attachment post caches.
+			_prime_post_caches( $attachments, false, false );
 			foreach ( $attachments as $attachment ) {
 				if ( 'attachment' !== get_post_type( $attachment ) ) {
 					return false;