Is there an actual serious claim that the first dose would be wasted? This claim is being made despite CLEAR CDC guidance on how to handle delayed vaccination

Is there an actual serious claim that the first dose would be wasted? This claim is being made despite CLEAR CDC guidance on how to handle delayed vaccination doses? I'm serious - where is the citation for the claim you are making that the first dose is wasted if the second dose is not perfectly on schedule. The reason this claim is likely a lie is that millions / billions of vaccines are given out. Every school child in America is getting vaccines. With very narrow exceptions, if you are off the exact timing (ie, you get a 12 month vaccine a bit later, you get the second shot 14 days later) which by the way happens ALL THE TIME because doctors and parents are busy etc - there is no evidence that the first shot is wasted or that you need to restart vaccination. So please provide a citation for the "first shot wasted" claim.