Sunken City Secret Already Available for discover

Beaststalker Tavish, discovered a Improved Emergency Maneuvers.
I have a screen shoot if needed

I’ll never understand why people tell us that they have a screenshot but then wait to share it until they are asked to share it.
But okay, here goes. Please, @Potter, could you provide us with a copy of the screenshot?

I had this as well. It looks like the pre-patch unlocked Sunken City cards for Discovery.
This probably won’t get fixed since SC is only a week away.

every release this happens, usually you found new cards in duels , or cards like Transfer Student have new mechanics before the release