None of the hardcore players has ever thoroughly tested the versions 1.6.1130+, don't count on Bethesda employees or "casual" players like Arthmoor to tell about engine bugs.
Arthmoor officially admitted his ignorance about frost-slow bug (solved in Scrambled Bugs mod), he consider the double-perk bug as an obscure bug.
I wasted
3 months
3 months
3 months (you hear this?)
between the end 2022 and the begining 2023
to convert my 1.5.80 Skyrim to 1.6.640
just to discover later this extremely nasty and undocumented
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caused by the ragdoll killcam (the bug is more obvious on draugrs).
And as a bonus 1.5.97 is currently the most stable version of Skyrim recommended by Ostim guide.