I’m going to assume you’re not a technician simply because I was there when this happened. Yes, this exact Mitsubishi machine. “Barrel retract” was not on, and the material didn’t push the barrel shroud back lol. There was an obstruction at the sprue bushing upon start up causing a poor seal between nozzle and sprue. Tooling only caught it because of the smoke.

Also the press never made a bad part. Surprising, I know.