UNRWA apparently responded by telling teachers to cool it because it was embarrassing. Some teachers removed their affiliation with UNRWA on their pages. An UNRWA teachers' group that had Jihadist videos was taken down , as were some of the Facebook pages.
But there is no indication of any disciplinary action against teachers who embrace jihad and antisemitism. Any teachers who would have been fired for that would have made it into the Arab media and there would have been protests supporting them. UNRWA cares about its reputation, not about the fact that its teachers love jihad.
They still do.
An UNRWA teacher who uses the name "poor slave" has a number of pro-terror photos: