diff --git a/wp-includes/blocks.php b/wp-includes/blocks.php
index 25a4a7e3b2..c09321edfa 100644
--- a/wp-includes/blocks.php
+++ b/wp-includes/blocks.php
@@ -2638,7 +2638,7 @@ function build_query_vars_from_query_block( $block, $page ) {
 			$query['s'] = $block->context['query']['search'];
 		}
 		if ( ! empty( $block->context['query']['parents'] ) && is_post_type_hierarchical( $query['post_type'] ) ) {
-			$query['post_parent__in'] = array_filter( array_map( 'intval', $block->context['query']['parents'] ) );
+			$query['post_parent__in'] = array_unique( array_map( 'intval', $block->context['query']['parents'] ) );
 		}
 	}
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 082d043fbf..ca1441ade0 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.8-alpha-59760';
+$wp_version = '6.8-alpha-59761';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.