A Reddit video shows a "hKtweaks was granted Superuser rights" message immediately following loading the screenshot, so it seems like maybe someone stumbled into an RCE for some image processer that is actively being exploited and trying to elevate privileges? Maybe the guy who took the video is using a custom ROM?
I don't know much about Android, but here's the video if that helps anyone in the know: https://v.redd.it/mzx6ftk4c7251