Lawsuit: Burger King cooking vegan burgers on same grill plate as meat

Does cooking a Impossible Burger on the same surface used to cook normal burgers "contaminate" them with meat by-products? Is Burger King doing this? A vegan diner makes these claims in a lawsuit filed Monday against the fast-food chain. Reuters:

The lawsuit filed in Miami federal court seeks damages for all U.S. purchasers of the Impossible Whopper, and an injunction requiring Burger King to "plainly disclose" that Impossible Whoppers and regular burgers are cooked on the same grills. [Burger King] describes the Impossible Burger as "100% Whopper, 0% Beef," and adds that "for guests looking for a meat-free option, a non-broiler method of preparation is available upon request."