Basically, the motion video is now being captured consistently. Very much a roll of the dice since the oneUI 3. update. Tho, I'm not sure if it's a camera issue or a gallery issue (12.0.00.45)..
Either way it's very bad because the camera shutter is so slow ..the motion photo saves a love of photos..
Have you tried resetting the camer settings? Camera -> settings -> Reset settings
Have you tried clearing the camera app cache?
Have you tried wiping the device cache partition?