My mount disappeared from inventory

I won the bronze drake mount from the dungeon, "the Stratholme massacre" and when I got out of the dungeon I went to the bank to save said mount, but when I clicked on it to transfer it to my bank, it literally disappeared, it is neither in my inventory nor at my bank, I logged out and back into the server but it still doesn't show up, it just disappeared...
Is it because of a bug in the game or what happened? I need help please :,(

I have pictures of when I win the mount and the ID of the dungeon in case it is necessary

Try disabling your addons and see if it's there.

If it's not then you have lost it. But the drake is a guaranteed drop from that boss, so if you do the dungeon again a few times you will get it again.