Yep , it caught me out once a few years ago, but was lucky and landed a job in a university, where it is not a requirement. I now have a new passport and it is not a problem for me anymore. Anyway, I am out of it now in Thailand and working for higher salaries at a lower cost of living in another country.
Any teacher working officially in a Govt't school MUST have one to get a WPermit, and every time you move school you use one life, as it were, on your temorary teacher waiver licence, so if you move 3 times to 3 different schools you're knackered if you want to move to a 4th school, and wont get the temporary licence a 4th time( thats how it usually works) but, if you stay in the same school you can get more than 3 issued.