I’d assume that a temporary-characteristic shouldn’t be taken as a permanent characteristic.
It was never specified that humans are something that stay human. Once you notice that, you’d start using “was a human” and “will be a human” as criteria. The plucked chicken clearly wasn’t a human before, and will most likely go into another obviously non-human state soon, so it doesn’t fit well as a human. The homo sapiens with the feathered suit used to be an obvious example, and soon will be again, so it fits well as a human.
It was never specified that humans are something that stay human. Once you notice that, you’d start using “was a human” and “will be a human” as criteria. The plucked chicken clearly wasn’t a human before, and will most likely go into another obviously non-human state soon, so it doesn’t fit well as a human. The homo sapiens with the feathered suit used to be an obvious example, and soon will be again, so it fits well as a human.