SBDChannelDelegate is notified for only message send event (iOS SDK 3.1.1)

I’m using the iOS chat sdk 3.1.1, and SBDChannelDelegate is working for only for a message update event.

When I invite/ban members, the corresponding method of the delegate (channelDidChangeMemberCount(_:)) is not called.

Any hints as to why the delegate methods are not working like they should?