The latest Beta B122 seems to ignore the frame rate setting. It recorded clips in 30p instead of 24p. Yesterday, half the clips I recorded were in 30P and the rest in 24p. And the day before, all the clips I had recorded were 30p (despite the setting for 4K 24p on my iPhone 6s). I am running the latest iOS 11.4 I restarted the iPhone just to be sure. (Toggling the frame rate from 24p to 30p and back to 24p seems to work to clear it, but I don't trust it. As I recorded some clips in 24p last night and then it happened today.) The previous beta had no issues with frame rates. Update 1 hour later: I'm confused, Test Flight allows rolling back to Build 118.