Bot api 6.9 not working (Cloud Storage)

[9en9i]

I'm developing a Telegram mini app. In my project I am using the new Cloud Storage api. I noticed that CloudStorage.getItem and other methods don't work. According to the documentation the second argument should be callback. The problem is that this callback is not executed in this client. My code using cloud storage api works in all other clients, so I conclude that the problem is in this client.