Have you considered that your problem might simply not be a priority for Ryanair to deal with?

If you're the only person complaining about it why would they spend time and money fixing it? i've no idea what fixing it would entail but at the very least it's going to require communicating/training it to every relevant member of staff , checking they understand, incorporating it into whatever regular training they get, making sure the anomoly hasn't confused and that staff are implementing all of the immigration rules properly. It could be an enormous undertaking and all because one customer doesn't want to get a passport?