[item2=burnt meatbot] and [item2=Festive Mushy Plushie] sort as Minions when I do that filter in my user shop. But they don't have Give to petname options or Add to Minion Zoo options.

Are they Minions, or not? If they are then they need those two features added to their options and they should be statted to fight. If they aren't, then whatever flag they've got that tags them that way for shops should be changed.

According to SL (which I know isn't official, but still helpful)

Meatbot is a minion and food, while Burned Meatbot is only food.

As for the Festive Mushy Plushie, there are 3 other plushies that also double as minions, so it might be helpful to suggest they be added.