How embarrassing. Gmail’s auto-completion changed for me today because I merged contacts on my Google and phone accounts. I frequently forward emails to “me” to have them stored on my private email as well, but “me” wasn’t me anymore. Instead, all the emails that I sent went to someone else (firstname.lastname@example.org) today.
I desperately need to re-train my muscle memory. I didn’t notice this until just now, 10 hours after the auto-completion changed.