Forced AI garbage seems to be Notes team's SOP at this point. They destroyed the handwriting experience on iPads, in iOS 18, with an incompetent spellchecker that can't be turned off. At least this math thing is somewhat unobtrusive, the spellchecker straight-up destroys notes. No acknowledgement of radars and no fix in sight, as expected of Apple I suppose.
Anecdotally even palm rejection seems to have gone to absolute shit in Notes with iOS 18. When I go to write now there’s like a 50% chance the scroll position flies up the document.
I also tried their “handwriting improvement” feature that claims to clean up lines a bit while still looking like your own writing. All it did was turn legible writing into total gibberish.