Same way if you call something a "wing" it has to be a wing? (I think this should be a thing but since that's not true the boneless part isn't)
Edit: I said that badly, let me rephrase (and this isn't my opinion I'm just trying to decode the logic): Because "Boneless Wing" already isnt technically true to what the product is (it's not a wing), then the other part doesn't have to be technically true (it's not always bonless).
Now if someone sold, a boneless steak with a bone, then under this logic it would not be allowed.
I mean i would be fine with some spicy nuggets instead (just put the same flavor on and you have boneless chicken something, just need to find a nice name for it and done, ready for the menu).
Well boneless wings has always been a bold faced lie anyway since they don't make them with wing meat.
I remember arguing on the phone with a person taking my order years ago the first time they offered me "white meat boneless wings" and I tried to point out that wings are dark meat not white meat so what they were selling wasn't really wings. They got pissed.
Maybe an actual wing got mixed up with the 'boneless' ones? I can't fathom how a (5 CM!!) piece of bone could get in the meat and be unnoticed by both the cook and the diner (who presumably chewed it before failing to swallow?)