No one here would have a clue as no one here works for Apple.
This support community is, largely, made up of volunteer Apple product users.
We are all just Apple product users here, just like you.
Mini-LED screens are hardware NOT software.
So, no amount of software upgrades/updates are going to fix a known limitation in this display hardware technology.
Apple chose mini-LED as a screen iimprovement that would NOT too drastically impact the purchase costs of the higher end 12.9 inch screen iPad Pro models.
As I stated, there will be a noticeable degree of blooming and edge shadowing.
I have seen this in the very expensive mini-LED flat screen TVs and it appears that this is a compromise to the more expensive OLED display panels.
To what levels/degrees this is happening on a screen by screen basis on these new 12.9 inch XDR screen iPad Pros is something I cannot comment on and this “notice-ability” of these known limitations could really be just a subjective one and NOT truly a defect of the mini-LED technology.
Sorry if this is something you didn't want to learn about, but this does NOT change what the inherent limitations of full array mini LED display technology has.
This screen blooming and shadowing maybe more prominent in much smaller display screens than it is on a much larger flat panel TVs using thr same mini-LED technology.
This maybe just is what it is.
Sorry & Best of Luck to You!