When I browse the list of available CTL font families, I find that many of the items don't offer, or don't seem to offer, any CTL language characters (or at least - no Arabic nor Hebrew). It's difficult for me to be 100% sure without bug 151122 being fixed, but - when I choose many of these fonts, what I seem to be seeing is fallbacks being used. I'm guessing the filtering of which font families are relevant for which language families is not reliable enough.
Eyal, would be great if you write here the list of that fonts here
(In reply to Roman Kuznetsov from comment #1) A few examples: A.C.M.E. Secret Agent Abecedario Abril Fatface Adobe Garamond (or some variant thereof) Agency FB Algerian as you can tell, I sampled the beginning of the list you get examples starting with 'A'... if you want more, let me know.