Rich found some bugs.
First, the camera app won’t open, or hangs when it opens, and no button anywhere will make it close or act like a camera. Not even the hard restart buttons. A minute or so later all my button pushes and screen taps show up in sequence. Or, the iPhone crashes and restarts.
I have that one, too. Very unlike Apple for the Camera app to freeze.
Second, what’s with all the apps in the background? No, I like them in the background, but iOS 13 is killing them too fast. That’s wrong.