Rice noodles soaked in hot water are harmful to health in plastic bags. The original material of plastic bags is PVC, which is toxic. If soaked in hot water, toxins will penetrate into food, which will definitely be harmful to health.

There should be no problem if the rice flour itself passes the hygiene inspection, so I don't know if the chef there has a conscience. You'd better try to pack it in a lunch box, which is better.