Mail app does not autocomplete email-addresses from contacts anymore on nc 14


just as the subject says. on nc 13, i’d start typing into the address-field when composing an email in the mail-app, and after three (?) characters suggestions from my contacts would start appearing automagically.
not anymore since upgrade to nc 14.
am i missing sth. here? is there a config that needs to be set?
THX for your input!