UE 4.22 Event dispatcher bug

In the latest version my event dispatcher stoped working.
See: I have a class BP_FireCell. It has an event dispatcer called FireStarted. Also, i got a child class called BP_Door. And in this class if i am trying to bind event to the FireStarted dispatcher of other object. But i got his:

This happens for all child classes of BP_FireCell. But it works in any class, that is not a child of BP_FireCell.
Is this a bug or something else?