_load_textdomain_just_in_time notice

Notice: Function _load_textdomain_just_in_time was called incorrectly. Translation loading for the ninja-forms domain was triggered too early. This is usually an indicator for some code in the plugin or theme running too early. Translations should be loaded at the init action or later. Please see Debugging in WordPress for more information. (This message was added in version 6.7.0.) in wp-includes/functions.php on line 6170

While the text domain says “ninja-forms”, this plugin is causing the issue.

The culprit is the HandL UTM Grabber plugin hooking into Ninja Forms too early:

1. handl-utm-grabber.php:24 — registers its merge-tags callback on the ninja_forms_loaded action.
2. ninja-forms.php:814 — Ninja Forms fires do_action(‘ninja_forms_loaded’) from inside its plugins_loaded() method, i.e. on WordPress’s plugins_loaded hook — which runs before init.
3. handl-utm-grabber.php:481 then does new HandLUTM_MergeTags(), whose constructor immediately calls:
   $this->title = __( ‘HandL UTM Grabber’, ‘ninja-forms’ ); // external/ninja.php:16

Disabling this plugin removes the notice.