diff --git a/lib/compat/wordpress-6.4/class-gutenberg-rest-block-patterns-controller.php b/lib/compat/wordpress-6.4/class-gutenberg-rest-block-patterns-controller.php
index 8128934b9b011c..3fb7eef547e469 100644
--- a/lib/compat/wordpress-6.4/class-gutenberg-rest-block-patterns-controller.php
+++ b/lib/compat/wordpress-6.4/class-gutenberg-rest-block-patterns-controller.php
@@ -27,6 +27,11 @@ class Gutenberg_REST_Block_Patterns_Controller extends Gutenberg_REST_Block_Patt
 	public function prepare_item_for_response( $item, $request ) {
 		$response = parent::prepare_item_for_response( $item, $request );
 
+		// Run the polyfill for Block Hooks only if it isn't already handled in WordPress core.
+		if ( function_exists( 'traverse_and_serialize_blocks' ) ) {
+			return $response;
+		}
+
 		$data = $response->get_data();
 
 		if ( empty( $data['content'] ) ) {
diff --git a/lib/load.php b/lib/load.php
index 40ab9c129af973..429bf6ce3257d1 100644
--- a/lib/load.php
+++ b/lib/load.php
@@ -94,7 +94,10 @@ function gutenberg_is_experiment_enabled( $name ) {
 
 // WordPress 6.4 compat.
 require __DIR__ . '/compat/wordpress-6.4/blocks.php';
-require __DIR__ . '/compat/wordpress-6.4/block-hooks.php';
+if ( ! function_exists( 'traverse_and_serialize_blocks' ) ) {
+	// Install the polyfill for Block Hooks only if it isn't already handled in WordPress core.
+	require __DIR__ . '/compat/wordpress-6.4/block-hooks.php';
+}
 require __DIR__ . '/compat/wordpress-6.4/block-patterns.php';
 require __DIR__ . '/compat/wordpress-6.4/script-loader.php';
 require __DIR__ . '/compat/wordpress-6.4/kses.php';
diff --git a/packages/block-library/src/pattern/index.php b/packages/block-library/src/pattern/index.php
index b117e31e125cf2..fc4652a7c22e89 100644
--- a/packages/block-library/src/pattern/index.php
+++ b/packages/block-library/src/pattern/index.php
@@ -41,12 +41,12 @@ function render_block_core_pattern( $attributes ) {
 	}
 
 	$pattern = $registry->get_registered( $slug );
-	$content = _inject_theme_attribute_in_block_template_content( $pattern['content'] );
+	$content = $pattern['content'];
 
+	// Backward compatibility for handling Block Hooks and injecting the theme attribute in the Gutenberg plugin.
 	// This can be removed when the minimum supported WordPress is >= 6.4.
-	if ( defined( 'IS_GUTENBERG_PLUGIN' ) && IS_GUTENBERG_PLUGIN ) {
-		// TODO: In the long run, we'd likely want to have a filter in the `WP_Block_Patterns_Registry` class
-		// instead to allow us plugging in code like this.
+	if ( defined( 'IS_GUTENBERG_PLUGIN' ) && IS_GUTENBERG_PLUGIN && ! function_exists( 'traverse_and_serialize_blocks' ) ) {
+		$content = _inject_theme_attribute_in_block_template_content( $content );
 		$blocks  = parse_blocks( $content );
 		$content = gutenberg_serialize_blocks( $blocks );
 	}