I contest on a technicality (TECHNICality). That is a 1×1 plate, centered between 4 studs, where there would not be as much stress placed as a wider plate, that would squeeze between the smallest gap of 2 studs.
OK, I see your point, so here is some further evidence:
the second picture is set 610 “Vintage car” from 1973
The third is set 609 “Aeroplane” from 1972