Just updated my game, have the arena mode options but no option for floor is lava mode :/
Try either restarting the client or briefly readying up in another mode (which will check the servers for updates & give you the correct playlists).
This thread was added on March 27, 2019, with posts from EpicDustyDevo, MrPopoTFS.
Original Post
https://i.redd.it/mb97p350yno21.png
Does it rise?
Drop in and see for yourself 😉