--interpolation flags do not work with "process" command?

[ypcyc]

None of flags are working?
--interpolation_use_gpx_start_time
--interpolation_offset_time -xxxx

I was truing both with different values, but I always get first point in desc .json with same offset

"MAPGPSTrack":[[-428285,24.640082,57.107715,56.483,null,1752342995.214]

gpx.txt

mapillary_image_description.json