Fix/64812 script modules eager loading

src/wp-includes/script-loader.php

@@ -2797,6 +2797,18 @@ function wp_enqueue_registered_block_scripts_and_styles() {
 			wp_enqueue_script( $script_handle );
 		}
 
+		/**
+		 * Enqueue view script modules when block assets are loaded eagerly.
+		 *
+		 * This ensures parity with script and style handles, as modules are not
+		 * automatically handled elsewhere when on-demand loading is disabled.
+		 */
+		if ( ! empty( $block_type->view_script_module_ids ) && function_exists( 'wp_enqueue_script_module' ) ) {
+			foreach ( $block_type->view_script_module_ids as $view_script_module_id ) {
+				wp_enqueue_script_module( $view_script_module_id );
+			}
+		}
+
 		if ( $load_editor_scripts_and_styles ) {
 			// Editor styles.
 			foreach ( $block_type->editor_style_handles as $editor_style_handle ) {

tests/phpunit/tests/blocks/wpEnqueueRegisteredBlockScriptsAndStyles.php

@@ -0,0 +1,78 @@
+<?php
+/**
+ * Tests for wp_enqueue_registered_block_scripts_and_styles().
+ *
+ * @package WordPress
+ * @subpackage Blocks
+ * @since 6.5.0
+ *
+ * @group blocks
+ */
+
+/**
+ * Tests for wp_enqueue_registered_block_scripts_and_styles().
+ */
+class Tests_Blocks_WpEnqueueRegisteredBlockScriptsAndStyles extends WP_UnitTestCase {
+
+	/**
+	 * Original script modules instance.
+	 *
+	 * @var WP_Script_Modules
+	 */
+	private $original_script_modules;
+
+	/**
+	 * Set up before each test.
+	 */
+	public function set_up() {
+		parent::set_up();
+		global $wp_script_modules;
+		$this->original_script_modules = $wp_script_modules;
+		$wp_script_modules             = null;
+	}
+
+	/**
+	 * Save the original script modules instance.
+	 */
+	public function tear_down() {
+		global $wp_script_modules;
+		$wp_script_modules = $this->original_script_modules;
+
+		$registry = WP_Block_Type_Registry::get_instance();
+		if ( $registry->is_registered( 'test/block' ) ) {
+			$registry->unregister( 'test/block' );
+		}
+
+		remove_filter( 'should_load_block_assets_on_demand', '__return_false' );
+
+		parent::tear_down();
+	}
+
+	/**
+	 * Tests that view script modules are enqueued when block assets are not loaded on demand.
+	 *
+	 * @ticket 64812
+	 */
+	public function test_view_script_modules_enqueued_when_not_on_demand() {
+		add_filter( 'should_load_block_assets_on_demand', '__return_false' );
+
+		$module_id = 'test-module';
+
+		wp_register_script_module( $module_id, '/test.js' );
+
+		register_block_type(
+			'test/block',
+			array(
+				'view_script_module_ids' => array( $module_id ),
+			)
+		);
+
+		wp_enqueue_registered_block_scripts_and_styles();
+
+		$this->assertContains(
+			$module_id,
+			wp_script_modules()->get_queue(),
+			'Expected view script module to be enqueued.'
+		);
+	}
+}