It doesn’t seem like registration is enforced in any meaningful way.
And most cops no longer track this stuff visually either. It's my impression that most patrol cars today have autonomous cameras installed that check every license plate in their field of view for expired registrations and outstanding warrants.
Many police cameras likely do facial recognition too. (Numerous states subscribe generously to commercial services that sell face recog with no independent certification of accuracy, which is famously terrible, like a 90% error rate.)
Or dropped the requirement for front plates. The best part about front plates is that they can drop off and remain at the scene of the accident (or embed themselves in the bumper) during a hit-and-run.