p-autocomplete renders autocomplete=off in the input elementRef in order to prevent chrome's cached autocomplete values from overlaying p-autocomplete's list box. However, chrome no longer honors that value. The current technique is to set autocomplete="no" ("no" being an unrecognized value by Chrome so it doesn't try to fill the input with stored values).
I initially tried using:
@ViewChild(AutoComplete) myAutoComplete: AutoComplete;
Unfortunately, for some reason inputEL was undefined even though myAutoComplete was being rendered
I wound up having to fix it by manually modifying node_modules\primeng\components\autocomplete.metadata.json and setting autocomplete=\"off\" to autocomplete=\"no\"
I suggest the above be implemented in the next version of primeng to keep-up with Chrome's current behavior.