Rear camera blurry since update to iOS 16

I've got an iPhone 12 mini. Until I've done the update to iOS 16, both of my rear cameras as well as the front camera worked perfectly. Since the update, the rear camera does not focus as it used to, leading to blurry pictures. If I use the front camera or the 0.5 back camera, everything works.

It's obviously a software issue (it worked before the update and afterwards no more) but all the help I could find so far was about hardware issues. I tried those out of desperation but - as expected - it didn't solve anything. Has anyone an idea how I could get Apple to look into this?