I created a tank of glass 10x10x6 filled with water on a creative/superflat world. No matter how long I stay underwater I can not see all the way across the tank (neither the glass or a sea pickle I place on the opposite side of the tank. I do not see similar issues in creative on a normal world. I have also tested with 3 status effects (night vision, water breathing and conduit power) and all 3 have no effect good or bad.
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Thank you for your report!
However, this issue is a Duplicate of MCPE-36078.
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