Hi all.

Sorry for bringing your attention to this topic - I’m sure it’s been touched on before, but here goes … In my JavaScript Phoenix client, I’m running React hooks, and there is a component -a “Game Room Channel” context provider function- which talks to a Phoenix channel counterpart, which in turn has a Presence.track function and an intercepted handle_out “presence_diff” callback (On the client, there is a useEffect hook that sets up Presence.onJoin and Presence.onLeave listeners. Everything appeared to be going fine until I added a Presence.update function to the Phoenix channel, this in order to update a status field in the metadata. Now, the client is reporting what appears to be a “leave/join episode from another device” in the metas, although the new device appears to be identical with the current one. Checking the presences map on the server shows a pair of leave/joins for the same sub-key within each leaves/joins key respectively, (in the first metas list element, there is a phx_ref under the leaves sub-key that matches the phx_ref_prev under the joins key). I’ve been able to suppress these spurious leave/joins on the client, but I was wondering if this is normal Phoenix Presence behaviour, or if I’ve done something wrong?