This bug is only in mcpe. Water vision in mcpe v1.2.20.1 is different with water vision in mcpe v1.5.0.1, i use brightness 60 for all version. Please fix it.
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Thank you for your report!
However, this issue has been closed as Working as Intended.
If you need help or have a suggestion you might like to follow the community support link below. (https://minecraft.gamepedia.com/Water#Light)
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Pretty sure this is intended.