What looks like another unfortunate bug, iPhone users have to watch out when using the Facebook app. It turns out that when you access the Facebook app on your iPhone, the camera will run in the background.
Twitter user Joshua Maddux shed a light on the issue showing the unusual behaviour on the iPhone. Based on the footage, you can see that the camera is actively working in the background as he scrolls through his feed. It turns out that this bug can be replicated on iPhones running on the iOS13.2.2. It's obvious that older versions, especially the iOS 12, does not have this problem.
Another person found out that the camera UI for Facebook stories kept appearing behind the video they were watching when flipping their phone from portrait to landscape and vice versa.
In a statement to The Verge, Facebook states that this is due to a bug that was inadvertently introduced in an app update released on November 8th and that it’s submitting a fix to Apple today. The company also stated that “we have seen no evidence of photos or videos being uploaded due to this bug.” Additionally, the company tells The Verge that the first issue identified in this article will be addressed by the fix submitted to Apple today as well.
As of now there's no fix yet so we suggest you either don't update your iOS, or if you have to disable Facebook's permission to access your camera.