I find this quite worrying. I think many people know here (not Ryanair people, they don't fly longhaul
) that an international Student ID card can be purchased in BKK for 2$, 10 minutes to wait. While an airline ID card (which allows you to go around the airport!) is much more of a document.
A friend of mine had a problem in CDG at the beginning of this ID procedure for the same reason. But shortly after (I think after the problem was reported) they started accepting it.
If Ryanair employees are smart enough, they should report the problem, and it should be fixed in a short period. Not fixing it would mean at the best carelessness and incompetence.