Key of Gnark

[Aemlin]

Hello,
yesterday evening I got the item: Key of Gnark

Fun thing of it is:
It does not open a new dungeon.
It has no stats on it.
I can not sell it for it has no value.
It has no corresponding sticker with it.

Is this item a bug?
And what can I do with it?

[sWiTcHeR]

never seen it or heard of it mate can you take a picture?

[Leander]

You never get stickers for keys. You have the key in your inventory, enter the dungeons and the dungeon is not opened? If yes, never heard such issue before.

[Kreuger]

its the key to my heart

[Aemlin]

If this is the 3rd dungeon key then how is it possible that I have already killed 2 monsters in the 3rd dungeon?
I thought I get the key and unlock the dungeon and it won't show up again.
If you forget to buy it in the shop when it is on display it can still drop but not after it is unlocked.

So did I stumble on a rare bug or what is going wrong here?

[Afelandra]

I like how its tounge is wraped around the metal part