Is it possible to test out subscriptions in playground somehow? When I hit play button, some purple dot is shown in tab, but no result is shown ... clicking again just shows error message "Cannot read property 'subscribe' of undefined"

you might need to reload if you recently changed the types in your project

ah that's better, haven't thought about that, thanks 🙂 nested subscriptions does not work? I read about connect/disconnect, but when I just update value of some field it's not shown, only top level value works