Reduced, huh...
the heck is UBFIZ? Undefined behavior fizzy smth? lol na, "Unsigned Bitfield Insert in Zero" - let's get into the details:
https://developer.arm.com/documentation/dui0801/l/A64-General-Instructions/UBFIZ--A64-
(yes people were puzzled 8 years ago already https://www.reddit.com/r/arm/comments/5icatl/ubfm_ubfiz_instruction_explanation/ )
Alrighty, time to get an advanced #Arm cheatsheet... to advance the advances of the RISC machines.
Just FYI: @Azeria made one with the basics!
https://azeria-labs.com/assembly-basics-cheatsheet/
PS yes I am seeing this in a binary. :)