How to get cookie value on ajax request in Yii2?

Question

Yii

I'm trying to get a cookie with:

Yii::$app->request->cookies->get(Partner::TRACK_TAG)->value

When I do this in a test action , I get the correct value:
2

The test action itself:

public function actionCookie()
    public function actionCookie()
    {
        var_dump(Yii::$app->request->cookies->get(Partner::TRACK_TAG)->value);
        die;
    }

When receiving occurs as part of an AJAX request , I get the encoded value:

6b8dac707515065fcc82a1ba3d9f8f4937bd2bffd5e3741be410e80ef7824924a:2:{i:0;s:1:"p";i:1;s:1:"2";}

I tried to put the CSRF token into the form (there is one in the meta tags) to check if it helps - it didn't help:

<input type="hidden" name="_csrf-frontend" value="<?= Yii::$app->request->csrfToken ?>">