Presence sends leave event for old subscribed channels when subscribing to different new channels

[hareshkalyani]

Nuget SDK PubnubPCL : 6.19.3

Our app has an online/offline feature, and we subscribe to individual chat when we go inside the chat.

On the opening of the app we subscribe to the self-presence channel userId-presence. so other users can check online/offline status by subscribing to its presence channel userId-presence-pnpres

The presence signal works well, and the HereNow call returns the right Online/Offline status based on subscription.

However when a user goes inside the chat and subscribes to a new channel chatroom1, it leaves presence to the old Presence channel userId-presence

This does not happen every time. If we Subscribe to a channel and Unsubscribe to a channel quickly or multiple times in quick manner it starts to give a leave signal in the presence channel.

Because of that, users seem offline at the other end, which makes the app not function well.