Guild Wars 2

I went through many posts and many problems, didnt see answer to this, i hope i dont repeat someone.
Ok so, i finished today map completion, got necromancers cache, and it didnt count to my dark harvest collection.
I still have it in inventory, collection tile is greyed out.
Im scared of opening it, so i wont need finish another map, if it disapears from my inventory (not really fan of this, sadly).
Should i open it, or what im doing wrong?

You need to open it for it to count. I’m doing the collection as well and it didn’t register until I did.

Thank you, worked. Btw this is pretty unclear and confusing.

Yeah it’s a bit annoying.

Also another tip, you DO NOT need the stealth detection mastery to get the mushroom. Find a treasure Shroom hunting group, and just stack where they are hitting, you’ll be able to tell if you’re hitting it from if your AA chain progresses or using marks. If you get in on it early enough to do enough damage you’ll get the shroom.