The ghast spawn rate seems to be broken in all new nether biomes. Killing a ghast makes another one spawn. There are approximately one ghast for every 16 chunks at all times.
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[Mod] OcelotOnesie
Thank you for your report!
We're actually already tracking this issue at MCPE-65762, so I will resolve and link 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.
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