diff --git a/wp-includes/post.php b/wp-includes/post.php
index 6ffd960c72..1fd84bc2c5 100644
--- a/wp-includes/post.php
+++ b/wp-includes/post.php
@@ -6392,7 +6392,7 @@ function get_posts_by_author_sql( $post_type, $full = true, $post_author = null,
  *                          'gmt' uses the `post_date_gmt` field.
  *                          Default 'server'.
  * @param string $post_type Optional. The post type to check. Default 'any'.
- * @return string The date of the last post.
+ * @return string The date of the last post, or false on failure.
  */
 function get_lastpostdate( $timezone = 'server', $post_type = 'any' ) {
 	/**
@@ -6400,9 +6400,9 @@ function get_lastpostdate( $timezone = 'server', $post_type = 'any' ) {
 	 *
 	 * @since 2.3.0
 	 *
-	 * @param string $date     Date the last post was published.
-	 * @param string $timezone Location to use for getting the post published date.
-	 *                         See get_lastpostdate() for accepted `$timezone` values.
+	 * @param string|false $date     Date the last post was published. False on failure.
+	 * @param string       $timezone Location to use for getting the post published date.
+	 *                               See get_lastpostdate() for accepted `$timezone` values.
 	 */
 	return apply_filters( 'get_lastpostdate', _get_last_post_time( $timezone, 'date', $post_type ), $timezone );
 }
@@ -6421,7 +6421,7 @@ function get_lastpostdate( $timezone = 'server', $post_type = 'any' ) {
  *                          for information on accepted values.
  *                          Default 'server'.
  * @param string $post_type Optional. The post type to check. Default 'any'.
- * @return string The timestamp in 'Y-m-d H:i:s' format.
+ * @return string The timestamp in 'Y-m-d H:i:s' format, or false on failure.
  */
 function get_lastpostmodified( $timezone = 'server', $post_type = 'any' ) {
 	/**
@@ -6452,9 +6452,10 @@ function get_lastpostmodified( $timezone = 'server', $post_type = 'any' ) {
 	 *
 	 * @since 2.3.0
 	 *
-	 * @param string $lastpostmodified The most recent time that a post was modified, in 'Y-m-d H:i:s' format.
-	 * @param string $timezone         Location to use for getting the post modified date.
-	 *                                 See get_lastpostdate() for accepted `$timezone` values.
+	 * @param string|false $lastpostmodified The most recent time that a post was modified, in 'Y-m-d H:i:s' format.
+	 *                                       False on failure.
+	 * @param string       $timezone         Location to use for getting the post modified date.
+	 *                                       See get_lastpostdate() for accepted `$timezone` values.
 	 */
 	return apply_filters( 'get_lastpostmodified', $lastpostmodified, $timezone );
 }
@@ -6472,7 +6473,7 @@ function get_lastpostmodified( $timezone = 'server', $post_type = 'any' ) {
  *                          for information on accepted values.
  * @param string $field     Post field to check. Accepts 'date' or 'modified'.
  * @param string $post_type Optional. The post type to check. Default 'any'.
- * @return string|false The timestamp in 'Y-m-d H:i:s' format, or false on error.
+ * @return string|false The timestamp in 'Y-m-d H:i:s' format, or false on failure.
  */
 function _get_last_post_time( $timezone, $field, $post_type = 'any' ) {
 	global $wpdb;
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 75b10d9dc9..2b2735bdc4 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.4-alpha-46972';
+$wp_version = '5.4-alpha-46973';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.