How to find the reason for the strange behavior of the script?

Question

Yii

Yes, I have no idea where to dig.
There is a project on yii2
In the afterAction of all controllers, except for the authorization one, there is a
script that remembers the user's url so that return $this->goBack();

public function afterAction($action, $result)
    {
        Yii::$app->getUser()->setReturnUrl(Yii::$app->request->url);
        return parent::afterAction($action, $result);
    }

Everything works fine except for 1 case.
Only at the customer, in all browsers, only when recovering a password (everything is standard for yii2), $this->goBack() redirects him to the page:
http://domain/here-language/css/https://fonts.googleapis ...
Why can this happen?

Answer 1

What is a crutch?
return $this->redirect(Yii::$app->request->referrer);
GoBack is needed to return from the jungle of links (for example, filling in fields in several steps) to one selected one.