I have never seen those, but recently learned the hard way that when the rice krispie treat recipe says to use fresh marshmallows, it’s NOT just a ploy to make you buy a new bag. I had a bag that was over a year old, but figured that since the ingredients are barely food, stale couldn’t mean much. Well, they refused to melt. I was using virgin coconut oil rather than butter. The pot was on the stove so long that the oil turned brown, but the marshmallows were still hard. I tried in vain to mash them, then added water, thinking a full boil would melt the marshies and evaporate the water. No dice. So, I can see where they could make marshmallow bits that are hard.
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