On my GoPro Hero 7 Black, I can choose to video in 720, 1080, 2.7k, or 4k. I can choose 24, 30, 60, 120, or 240 fps.
I wanted to take a video that I didn't need to be able to slow down, and did't need super high quality, so I tried to set it to 720 at 30fps. However, it bounced back to 60fps and told me "30 FPS is supported at 4k, 2.7k, and 1080."
I can understand not being able to video in the higher resolutions at a higher frame rate, such as not being able to video in 4k at 240 (no matter how cool that would be). But why would 30fps in 720 be a limitation? Is it somehow more difficult to video in 720 at 30 FPS?
This also applies to 24fps, BTW.