It actually seems like it could be related because of a change in the prediction model that places emphasis on this type of "learning"

There are literal slow motion videos on YouTube showing people pressing the correct intended next character and iOS "correcting" it to something else because it predicted(?) that they actually meant something else.

When the first iOS 27 beta came out, it was actually really good for me. But later betas and now the public release ruined it once again. It's unbelievable how bad it is.