Ghasts naturally spawn in massive numbers in the new Soul Sand Valley biomes. They don't seem to make any appearances in any of the other nether biomes, not even the classic Nether Wastes. Gamerule doMobSpawning is true, and this is all on a singleplayer world. I've attached a few images showing about 6 ghasts at once, as well as a video where they moan like crazy.
NOTE: I have searched for this issue to see if anyone has already reported it, and saw nothing, at least not related to the Java Edition.
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Thank you for your report!
We're actually already tracking this issue in MC-170840, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.
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Of course, it's not until after I make this report when I see dozens of them already made, and I didn't find them because my search query was slightly different from how these other reports were worded. Guess this qualifies as a duplicate?