Probably just omission of https://www.openstreetmap.org/changeset/70550168 ; if https://www.openstreetmap.org/way/492053167 https://www.openstreetmap.org/way/492053166 https://www.openstreetmap.org/way/492053151 https://www.openstreetmap.org/way/492053149 are all `maxspeed=80`, then obviously https://www.openstreetmap.org/way/492053143 and https://www.openstreetmap.org/way/492053141 would also be `maxspeed=80`, no way the speed limit would change so suddenly for a short section for no reason.

Resolved via https://www.openstreetmap.org/changeset/176606749 ; closing.