So in realms today I switched the difficulty from hard to peaceful because I wanted to fix lag. I went in the nether to travel back to my base and I heard ghasts, so that tells me that they did not die whenever I switched difficulties.
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No I didn't see the ghast but I heard the sounds from it. The difficulty was on peaceful and whenever I switched back to hard the other nether mobs were spawning like usual.
Probably some sort of sound issue rather than mob spawning. But it is still a bug though.
Did you here anymore ghast sounds after you stayed a while in the same area though?
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However, this issue has been closed as a Duplicate of MCPE-27625.
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Did you actually see any ghasts ? This could be more of a sound latency.