This one gap (with no images) I would expect as GPS misread by some reasons because GPS around the place looks good. At the same time, other images look fine. Denser on lower speed (less than 50 km/h) and bigger gaps (approx. 20 meters) for higher speed.
@Eric_S, you’re confident that GPS on a gap place was good and Mapillary Android should have taken the normal images there, right?
Hm… There’s always a chance that the camera was busy and returned the image late, or something else and unique. But I have no leader of those ideas for now.