This does not surprise me. There are typically 5-6 discrete business systems involved in debit card issuance. Only 1 of them is implicitly responsible for ensuring the number is valid before the rest of the process begins. The card printers (at least ones I've dealt with) are certainly not taking the time to validate this information. I do not think the debit switch networks have any integral validation/exceptions for card numbers, as long as the bins are valid. It is ultimately the responsibility of the merchant/acquirer and issuer to verify this information is accurate.