I have the same problem with my iPhone 16 pro. Here's my video that does the same thing as yours. Macro works fine on photo mode but on video mode it only works on 4k 60, HD 30, and HD 60. It does not work on 4k 24 or 4k 30 it freezes and then restarts with the main camera.
Here’s a video link showing what happens with the macro:
I’ve come across another camera issue in addition to the macro lens freezing in 4K 24 and 4K 30. When I start filming in 1x, I’m able to switch between 2x and 5x, but I can’t switch to .5x. However, if I begin recording in .5x, I can shoot fine, but the moment I try switching to another lens like 1x, 2x, or 5x, the camera freezes, stops recording, and reverts back to the main lens. Is anyone else experiencing this issue? I’m filming in 4K 24 fps and avoiding HDR because, as a content creator, HEVC codecs aren’t practical for me.
Here’s a video link showing what happens with the camera lenses: