Apple has been quick to release minor updates to iOS 13.1 and iPadOS 13.1. The second update, 13.1.2, has a whole list of bug fixes for users. Most notably, it fixes a Camera app bug and a car Bluetooth connection bug. It also fixes a problem where sometimes the flashlight feature didn’t work.
See Apple’s page for a list of fixes and changes in iOS 13.1.2 and earlier versions of iOS 13 as well.