To dev/game designer/admin who may read:
It would be better experience and transparent if you post a mail explaining items got deducted by system due to roll back or bug related issue. Some of us may click that casino rewards clumsily. Some has complain lots of gems got deducted.
The report should be made transparent regarding how many gems got deducted in return of what items.
Not that I did abuse the bug, but now I am worried that my gems being deducted when I don't claim any from the casino slot yet.