Do not use filters

src/wp-includes/default-filters.php

@@ -772,8 +772,4 @@
 add_filter( 'rest_prepare_wp_block', 'insert_hooked_blocks_into_rest_response', 10, 2 );
 add_filter( 'rest_prepare_wp_navigation', 'insert_hooked_blocks_into_rest_response', 10, 2 );
 
-// Filter the pages endpoint to consider orderby_hierarchy.
-add_filter( 'rest_page_query', 'rest_page_query_hierarchical_sort_filter_by_post_in', 10, 2 );
-add_filter( 'rest_prepare_page', 'rest_prepare_page_hierarchical_sort_add_levels', 10, 3 );
-
 unset( $filter, $action );

src/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php

@@ -402,6 +402,8 @@ static function ( $format ) {
 		// Force the post_type argument, since it's not a user input variable.
 		$args['post_type'] = $this->post_type;
 
+		$args = rest_page_query_hierarchical_sort_filter_by_post_in( $args, $request );
+
 		/**
 		 * Filters WP_Query arguments when querying posts via the REST API.
 		 *
@@ -2090,6 +2092,8 @@ public function prepare_item_for_response( $item, $request ) {
 			}
 		}
 
+		$response = rest_prepare_page_hierarchical_sort_add_levels( $response, $post, $request );
+
 		/**
 		 * Filters the post data for a REST API response.
 		 *