Peel has clear cases. Two models. The first is a hard, clear case with cutouts for all of the buttons. The second is a softer, TPU clear case with all buttons protected. I'm thinking about the softer, TPU version, but I have to email them first to see if it's anti-yellowing / anti-bubbling.
Peel is the original and best super thin iPhone 12 Pro case. Just 0.35mm thin and branding free, it's designed to keep the original look of your phone while protecting it. Ditch the bulk and slim down with Peel. Available in multiple colors.
buypeel.com
The clear options are the last two in the color palette.