diff --git a/wp-admin/includes/template.php b/wp-admin/includes/template.php
index ad87a89521..e759042627 100644
--- a/wp-admin/includes/template.php
+++ b/wp-admin/includes/template.php
@@ -2223,6 +2223,9 @@ function get_post_states( $post ) {
 	 *
 	 * @since 2.8.0
 	 * @since 3.6.0 Added the `$post` parameter.
+	 * @since 5.5.0 Also applied in the Customizer context. If any admin functions
+	 *              are used within the filter, their existence should be checked
+	 *              with `function_exists()` before being used.
 	 *
 	 * @param string[] $post_states An array of post display states.
 	 * @param WP_Post  $post        The current post object.
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 5134411c19..2a26d7f092 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.6-alpha-48909';
+$wp_version = '5.6-alpha-48910';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.