Recently I came across the below sentences.
Biden has been predicted the winner in states from Virginia up through the East Coast. Other states called as Biden victories include California, on the west coast. Trump was the predicted winner in much of the South, including Alabama, as well as several central states, including Kansas and Missouri. [1]
another sentence where "was/were predicted" is used
High self-conscious individuals were predicted to drink following personal failure and avoid drinking following personal success in an attempt to control their sensitivity to the self-relevant implications of such events. [2]
i dont know if there is any difference between these two usage, because for me, both of them seem to mean prediction made in the past.
note: the second sentence can be seen only in the full text which can be downloaded here. One can find this whole sentence with google