Can't run Solo Rally3 in Quickplay because of content missing

Been trying to run multi event rally with Rally3 class. Just me by myself and AI. I choose my car and am able to play the first session fine. When I close the game and reload, it advises me that content is missing and I am unable to continue my save of the Rally3 class in Quickplay. I'm guessing this is due to the AI choosing a DLC car, which I do not own.

Can this please be addressed so I can do a Rally3 rally over multiple sessions? Thanks