[2019] A key in my inventory got duped after an error saying I didn't have enough room in my stash for rubels when selling items. How do I go about this?

Originally posted by LilNotorious

EDIT: Possibly(!) duped, I do not recall ever looting a second 303 key, and noticed it in my stash after the error popup. I feel like I should address this since duping could destroy the games economy if it were to be possible, and I don't want to spread nasty rumours around.

Some details:

This happened after a successful scav raid on factory. All items were transferred into my stash. After that I sold various magazines and light body armor to prapor.

During this the message popped up alerting me about not enough stash space. The armor got sold, the magazines didnt. I got the rubels for the armor and proceeded to sell the magazines after space became free where the armor used to be. The extra key appeared after the armor sale.

I have not logged out yet, nor started another raid. EDIT: I did both of those things, key remains in stash.

I am able to sell the key, as in it is its own item and not just an icon bug.