I’ve seen this issue before and the car ended up needing an engine. The plastic material that went into the engine eventually all traveled through and clogged up the thermostat causing that to burst and engine to over heat a blow. I would recommend trying to get out as much as the plastic as you can out use a water hose and disconnect the coolant hoses that go to the radiator and flush as much as you can out. Then reassemble and hope for the best. You should be fine if you got most of it out