The vending machine in the Shipwreck treasure hunt area has many of the same items I already purchased in Penguin Point and if you purchase them again it just wastes your star coins.

Also, the daily catch isn't working right now. It's showing the knife fish as the daily catch in Caster's Cove, but my mission log shows it being the Polar Perch and already being caught which was the previous day. If I catch the knife fish it doesn't reward me with any coins.