Yeah, unfortunately hong kong/chinese breeders do not cull this deformity, instead they let it perpetuate because if they cull it, they lose the 5 USD they could have sold it for.
Experienced buyers will see it and refuse to buy, so be careful about a "great deal" on taiwan bees, usually it is because they are from these tainted hong kong/chinese bloodlines. You will see them a lot more in the USA now, due to increased smuggling. Sad, but Americans don't care about quality, only about price.
There's also the "short skirt" or "shrunken carapace" mutation that is common in Taiwan bees, also to be avoided, and also causing health problems.