If you have a levitation higher than 128 and jump, it pushes you down again but the jump score doesnt increase.
Untested on lower versions.
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violine1101
MC-102718
Jump stat doesnt increase with levitation effect
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violine1101
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Minecraft 16w21b
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Probably intended - values higher than 128 count as negative values with all potion effects: level 129 is -127, level 256 is -1.