I just encountered a nasty bug on my account (Studs). I bought a 10 gem pack, dropped a hobgoblin (new to me) in it, and immediately went to troops, Zaejin filter, then tried to max ascend. When I did I got the following error message and had to hard restart. Upon my return the hobgoblin was missing. From what I remember, no other cards are missing.
If possible, I would very much like this card added back to my account.