/arena select in Custom Lobbies not disabled

PC (most likely works in Mobile too)

Dimensions or Services it affects
Gamemodes > Zombies Survival

Your in-game account name

How often it happens
Whenever a custom lobby is made

Any screenshots or videos showing the bug

The image showcases my ability to edit my map in a custom lobby. As far as I’m aware, mb lobbies have been disabled until the next update. If there is a problem caused by editing maps atm or whenever the update is rolled out, this might be an issue.