Yesterday I did my bounty on mobile and the chat buttons disappeared till after I finished my bounty and received my 1k gralats. I don't know if this is a new update or it's a bug...I tried doing it on pc today too and the chat buttons disappeared again. I reloaded the game and it appeared but disappeared once I had my bounty with me...

edit: I press the tab button for public chat and it still works just the chat button is nowhere to be seen.