Google Meet does that. Confirmed it just yesterday. However it couldn't tolerate cellular network blackouts for a minute or two while on-the-go.
No shit. QUIC is great but doesn't work when the Internet is unreachable.
I may be walking outside with gloves in a freezing temperature not excited about taking phone out. But actually I was in train so no issues. Second time I was cut off when I was walking and explaining things for a few minutes... only to realize I'm dropped out of conversation - again I needed to manually reconnect by explicitly tapping on that button.