Bora for example brought their own kitchen truck to avoid situations like this. The riders have dinner in the bus/truck.
I was pretty surprised when Van Emden mentioned about buffets in his interview, I thought for all of the money Jumbo Visma have put in to trying to one up Ineos, and all the micro-managing they do with respect to rider diet and ketones, the least they could do was use a cook for a grand tour?