When you thrown a potion it spams the following on the console:
"Thrown potion entity # has no item?!"
a bunch of times until the potion entity has died.
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Fixed in 15w47a and duplicate of MC-92559. Please take a look at there to view more info about this report.
kumasasa
Actually it's MC-11834
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Oh, sorry about that.
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Well, it still happens even though potions are fixed. Which is probably because thrown potions still look like a awkward potion.