[dredmorbius]

I don't know whether or not this is a factor, but apparently the Goldstone Solar System Radar (GSSR) facility used can operate in either of two modes, monostatic in which the Goldstone facility both sends and receives radar transmissions, and bistatic in which Goldstone transmits whilst two other facilities receive the bounced signal.

<https://en.wikipedia.org/wiki/Goldstone_Solar_System_Radar>

It seems possible to me that for a near-earth object it might be possible for a bistatic image to show a perspective difference between the side nearest the transmission and receiving antennae.

Though at five times Earth-Lunar distance (about 2 million km), any such parallax baseline would be minimal (13 thousand km).

The postprocessing explanation offered elsewhere seems far more likely.