Rivian (NASDAQ:RIVN) stock is sliding lower on Thursday after Morgan Stanley analysts issued a warning for investors in the electric vehicle (EV) company.Morgan Stanley analysts reiterated their “overweight” rating for RIVN stock today. For comparison, the analyst consensus rating for the company’s shares is a moderate buy based on 23 opinions.Unfortunately, that update comes with a warning traders will want to keep in mind. Here’s what Morgan Stanley said about RIVN in a note to clients obtained by CNBC:“W ...