I have tried everything I could think of, formatting the card, installing a game without it, removing it, restarting and then inserting it.
No matter what I try, the deck keeps setting it as the default drive.
I’m on stable release, latest update. Happens on both new OLED model and LCD.
I just noticed that on mine too. Possible bug with the latest release so we’ll probably have to deal with it until the next update