So..... I don't know if this is a bug or not? But I am pretty sure that with the levetation effect you should not go down in water. This bug is still in 1.12 pre-4.
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MC-117681
levetation effect does not work in water
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(Unassigned)
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Minecraft 1.11.2, Minecraft 17w18b, Minecraft 1.12 Pre-Release 1, Minecraft 1.12 Pre-Release 2, Minecraft 1.12 Pre-Release 3, Minecraft 1.12 Pre-Release 4
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