Multiplayer on Minecraft PE gone with update to version 12?

My son and I have been playing for months on our iPads using multiplayer mode. We could join in the same world that one would host.

With the latest upgrade to version 12, even with multiplayer on, we cannot see each other’s world to join (there used to be the radiating green signal).

Is this option gone or is there a new way to join?

Both devices are running the same platform. Thank you.