potion lingering problem

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Do you mean Poison Lingering Potion?

Poison Lingering Potion is a new potion in snapshot minecraft 1.9

Watch video

Could you clarify what you mean? Because I don't understand your problem.

When I launch a lingering poison potion as in the video effect "poison" bug!

For 1.9: throwing lingering potion on (top of) the cow doesn't damage him because the poison is above him, throwing the lingering potion next to the cow causes the poison effect to damage the cow.