Java edition has ambient sound effects when entering a new biome in nether or while diving in the water. While in bedrock edition it is just plain silence and only nether OST playing.
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[Mod] OcelotOnesie
migrated
Thank you for your report!
We're actually already tracking this issue at MCPE-79532, 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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