The reason most people would be rushing to the boss is because you have to actually complete the mission once, in order to unlock the ability to trigger them personally as spawns in free roam forest. Until you do so, the only way you will see them spawn in free roam forest is if someone else is in the multiparty area that HAS completed the emergency quest and beat them in the boss room.
Give it a week or so, once people have done the boss room they will just hang in area 1 and 2 for the bursts
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