Quoting from mapillary_tools/README.md at master · mapillary/mapillary_tools · GitHub, the section
Derive image direction (image heading or camera angle) based on image latitude and longitude. If images are missing direction*, the direction is derived automatically, if direction is present, it will be derived and overwritten only if the flag
--interpolate directionsis specified.
As with the GoPro9, where the GPS Img Direction entry is lacking in the EXIF-section
Please refer to my sequence of 9 June, where the ways were captured in both directions, yet the fans all point due north.
As an aside, the lacking parts of sequence issue - posted as Sequence taken 5 June (uploaded few days after) still only part visible on maps - is also present here, and on this occasion the pics were uploaded several days ago - hence well after the previous issue was solved, and don’t appear in the OSM iD editor either.