Seems it’s still definitely around whatever it is, certainly not 100% resolved.
I experienced the same black squares in Scotland during a race event tonight; I presume again from the tron bikes.
It wasn’t at all as severe, they only appeared for about one frame, and only a handful of times (probably <10 counts total), so it was way more of a very short flicker that resembled a box, versus the more obvious black boxes from previous versions that could stay stuck for multiple frames.
They weren’t nearly as obvious, but whatever causes it is not completely gone unfortunately.
Of course we’re now on 1.45
Looks like I wasn’t the only one: