Even after bugfixes in 0.13, Ghasts still don't spawn naturally in the nether on worlds made before the 0.13.0 update, and worlds made after the update work fine. My difficulty is up so it's not that. If I use a spawn egg or a mob spawner it works.
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No, I am on hard mode. The world was made back in 0.12.1 of Windows 10 Edition. I'll make a new world and report back.
EDIT: So I made a new world and it works fine, so it seems to only work on worlds made after the update. Will change this report to reflect.
Are you in peaceful? When was this world made?