Yes, kinda, they had a tendency to blow the fire up augers and into hoppers.
I thought so. I seem to remember from my IBC days (20+ years ago) a couple discussions about that happening. Probably more prevalent with pellets than corn because corn takes a lot more heat to combust than pellets do.
If I remember back, I had that issue with my first pellet appliance, an Englander. Up the feed auger, bridged the auger and into the top feed auger and into the hopper. Only one time and it was a stinky mess too. Glad I was home and caught it or it would have burned the house down.