Adventure Chat tab not function correctly

[andi13]

If I join somebody's adv, we get the chat tab show up,

If I then start my own multi-player adv, a 2nd tab used to show, but for a while now the 2nd tab has not shown, so in some instances we are unable to chat about the adv unless we use another tab

[Innit]

Same for me except I've only ever seen one adventure chat at once.