diff --git a/src/wp-includes/blocks.php b/src/wp-includes/blocks.php
index 9df70abaf4..a2fd54cf31 100644
--- a/src/wp-includes/blocks.php
+++ b/src/wp-includes/blocks.php
@@ -286,6 +286,7 @@ function register_block_type_from_metadata( $file_or_folder, $args = array() ) {
 		'title'           => 'title',
 		'category'        => 'category',
 		'parent'          => 'parent',
+		'ancestor'        => 'ancestor',
 		'icon'            => 'icon',
 		'description'     => 'description',
 		'keywords'        => 'keywords',
diff --git a/tests/phpunit/data/blocks/notice/block.json b/tests/phpunit/data/blocks/notice/block.json
index d448a49c5c..56ffe73407 100644
--- a/tests/phpunit/data/blocks/notice/block.json
+++ b/tests/phpunit/data/blocks/notice/block.json
@@ -4,7 +4,10 @@
 	"title": "Notice",
 	"category": "common",
 	"parent": [
-		"core/group"
+		"tests/group"
+	],
+	"ancestor": [
+		"tests/section"
 	],
 	"providesContext": {
 		"tests/message": "message"
diff --git a/tests/phpunit/tests/blocks/register.php b/tests/phpunit/tests/blocks/register.php
index 408927197a..6dcc0f8d04 100644
--- a/tests/phpunit/tests/blocks/register.php
+++ b/tests/phpunit/tests/blocks/register.php
@@ -381,7 +381,8 @@ class Tests_Blocks_Register extends WP_UnitTestCase {
 		$this->assertSame( 'tests/notice', $result->name );
 		$this->assertSame( 'Notice', $result->title );
 		$this->assertSame( 'common', $result->category );
-		$this->assertSameSets( array( 'core/group' ), $result->parent );
+		$this->assertSameSets( array( 'tests/group' ), $result->parent );
+		$this->assertSameSets( array( 'tests/section' ), $result->ancestor );
 		$this->assertSame( 'star', $result->icon );
 		$this->assertSame( 'Shows warning, error or success notices…', $result->description );
 		$this->assertSameSets( array( 'alert', 'message' ), $result->keywords );