On top of all the issues (confirmed or not), I was finding the same. A lot of applications optimised for iPadOS are *not* optimal on the Mini 6. I was finding I often had to tap controls 4-5 times before the tap would register, often the wrong element on screen gets selected instead. I loved the size/weight/portability of it, but in the longer term I think the use cases (for me) would have proven too few.
Ended up swapping for an iPad Pro 11, and in a day's use it has addressed all the concerns I had with the Mini with the bonus of the M1 processor. Cost about £200 more for the same configuration, but I think money well spent.