Don't worry, I sold mine too. Loved it at first but it was a garbage device to me in the end. I couldn't get over how bad the screen was. Went with the 11 Pro and no regrets. Wish I had gone with the Pro in the first place and save myself from losing money on the mini 6. Mini 6 is the worse ipad for value in the current lineup. It should be about $50 cheaper. But I fell for the hype and got one.
Saw no point in keeping a device that had such poor scaling. Apple might or might not fix it and even if they did, it could be a 2 year wait. A big risk to take. I buy devices that are usable and fully optimized today, not in a year or two.