When I join to Diadem I see objectives, like collect 8 bronze chest, mine 12 nodes, botany 16 nodes, collect some red crystal, collect some white crystal.

So fighters are gonna collect chest, gatherers are going for nodes, somebody will collect crystal and thats it.
I dont see anywhere written that i am supposed to farm mobs at dino island for 80 more minutes after objectives are completed.

Can you please explain to me why some people are expecting this?