Card banished face-down to activate Pot of Prosperity is being revealed to the opponent

[flummi]

When a card is returned from the Field to the Extra Deck, and then later used for the cost of Pot of Prosperity, it might be:

1. Mentioned by name in the game log, even to the opponent.
2. Visible face-up while viewing the banishment, even to the opponent.

Screenshots:

[Vee4]

Its a known issue that should be resolved with the next client update.