https://thenextweb.com/apple/2019/09/30/apple-third-ios-13-patch/

For those of you who just checked your iPhones or iPads and saw you have another software update available — no, you’re not going crazy. Apple today pushed out iOS 13.1.2, which will hopefully bring the number of bugs down to manageable levels.

iOS 13.1.2 is the latest in a line of rapid fire updates, iOS 13.1.1 having come out last Friday and iOS 13.1 having come out just three days before that. The update notes state iOS 13.1.2 fixes a few major bugs, including the flashlight or the camera not working. It also fixes a few issues with Shortcuts and a stalled iCloud progress bar (the iPadOS update released today fixes the same issues).