Ehy Guardians,
As you know if you follow the weekly Quest, at this round we have to kill 50 Champions either in Expeditions or Master Ketchcrash to advance.
If you're matched with Guardians in Expeditions that throw away Treasures is because they don't want the cargo to move without the Ruffian to spawn. Wait for the Ruffian to Spawn before reach the 100% completion of the cargo. In this way you'll help who still has to complete the step.
Thanks =)
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Correction: Wait for the Ruffian [i]to die[/i] before you go to 100%. It'll despawn if you hit 100% while it's alive.