This may be a new bug. I hope there is a patch as this has stopped our users from submitting their college applications when they enter their GPA and it does not allow decimal.
I can't think of any other input to test this on in the desktop 130.0.6723.70/PWA/mobile Chrome 130.0.6723.86 outside of XFES (where an input doesn't have to be a whole number).
The only way around this is saving it as 2, otherwise you can't select any forums to opt-out of.