Guild Wars 2

I need to do collection of Dark Havest.

Today I’ve try to kill treesure mushroom for invisible reaper’s mushroom spore

but I killed it by my Berserker, It’s only drop invisible berserker’s mushroom spore.

After that I try it by my Reaper but it’s not drop invisible reaper’s mushroom spore.

It’s not 100% drop chance or Bug?

It drops these items in alphabetical order by the elites you have unlocked. So if you have chronomancer that would come next. Reaper would be closer to the end with temptest.

The reward you get is from a daily side chest. It would have been wiggling on the side when you opened it. Side chests are almost always daily which means you have to wait until reset to get another. Now there are more treasure measures in the other zones. They also have a daily side chest. So you can do a few treasure mushrooms per day then do them again for the side chest after reset.