From my experience I am able to join other players who also have a Wi-Fi 6 network but if they do not then I won't be able to join their server and vise-versa, when I attempt to join their world it'll stay on 'loading multiplayer world' until I cancel or the game says 'unable to connect to world'. This also happens for the recent 1.17.1 patch for the Nintendo Switch version of the game.
superJOSHgaming
From my experience I am able to join other players who also have a Wi-Fi 6 network but if they do not then I won't be able to join their server and vise-versa, when I attempt to join their world it'll stay on 'loading multiplayer world' until I cancel or the game says 'unable to connect to world'. This also happens for the recent 1.17.1 patch for the Nintendo Switch version of the game.