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Actually, I think it is the "genAI" as part of writing tools and Siri update. I think I misremembered for my description and it was being applied to form fields for different configuration panels.

I just tested it with text inputs on a form. It triggers with peoples's names from your contacts. It also triggers with capitalisation like typing something like "fedex". If you type really quickly you're fine, and if you type slow you have time to play with the settings. Speeds the middle with these "Spelling and prediction" settings end up with text changing. Enter and space seem to always trigger. A delay thinking of the next word seems to sometimes trigger. Seems new to me and the contacts suggestions seem aligned with the integrated Siri they're advertising (and sure technically you could probably say it isn't genAI)

Anyway, I'm turning the settings back off now

Yeah, I wouldn't surprised to be wrong with how frustrated I was with words in config files changing + commands in the terminal having words updated just as I hit enter to run them. I updated yesterday, haven't had this issue before, and it stopped happening when I turned off those settings. I'd turned similarly named settings off on the iPhone years ago but never noticed them on the mac. With the names of the settings and the very similar fail mode to when genAI is added to IDE (things like updates being accepted when you hit the right arrow), I did assume a bit.

It still seems odd for me. I can't remember the mac ever taking what I wrote and changing it without some input from me.

Either way, my issue seems to have stopped so I'm pretty happy turning the settings off.