Hearthstone Duels Bug with treasure

I lost the game cause of the bug with the treasure “Kill 1 opponents minion, get 1 corpse and 1 card to your hand. Upgrades on duels survey”. It was unaible to use this card at first i thought it’s because an opponent had not enough minions to be killed but the treasure was “kill 3” and he had 3 minions. I’d like to share the screenshot but don’t see if i can do it from this form.
P.S. sorry for my bad eng, it’s not my native language.
Aprreciate if you send me a response.

Literally in the pinned posts at the top of the forum page you posted in…