When entering the water in spectator mode the underwater soundscapes do not play ~ nor do they play when switching back to any other game mode; you need to exit the water in another game mode and then re-enter it to get the soundscape to begin playing.
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Thank you for your report!
We're tracking this issue in MC-261312, so this ticket is being resolved and linked as a duplicate.
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Would MC-261312 describe you're issue?