yii2: matchCallback in version 2.0.15 don't work

After I update version of Yii to 2.0.15, matchCallback in Controllers don’t work On 2.0.14 it works perfect. Code example: [ 'actions' => ['image-upload', 'login-exist', 'reg-master', 'settings-master', 'yandex-wallet', 'review-comment', 'master-hide-dialog', 'master-message'], 'allow' => true, 'matchCallback' => function($rule, $action) { return Yii::$app->request->isAjax; } ], Function returns bool(false). Do yo have the same issue or it’s my bug?

Yii version 2.0.15 PHP version 7.0 Operating system Ubuntu 16.04