Fix script module dequeue race condition (#76170)

Co-authored-by: adamsilverstein <adamsilverstein@git.wordpress.org>
Co-authored-by: ramonjd <ramonopoly@git.wordpress.org>
Co-authored-by: mcsf <mcsf@git.wordpress.org>
Co-authored-by: youknowriad <youknowriad@git.wordpress.org>

Author: 4 people

packages/wp-build/templates/module-registration.php.template

@@ -10,6 +10,16 @@
  * Register all script modules.
  */
 function {{PREFIX}}_register_script_modules() {
+	// Ensure this only runs once. wp_default_scripts can fire multiple times,
+	// and each wp_deregister_script_module() call also dequeues the module.
+	// If a module was enqueued between calls, repeated deregister/register
+	// cycles would lose the enqueue state.
+	static $already_registered = false;
+	if ( $already_registered ) {
+		return;
+	}
+	$already_registered = true;
+
 	// Load build constants
 	$build_constants = require __DIR__ . '/constants.php';
 	$modules_dir     = __DIR__ . '/modules';