I am currently playing on a full vanilla whitelisted minecraft server with version Minecraft 1.9.1 Pre-Release 3, i needed xp for a mending pick and attacked a pig men. Once i attacked a pig men the server started to lag a lot. Pig men we're jumping around, only moving a few blocks per about 3 seconds each, then my server crashed.
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see MC-94554, which is resolved as duplicate of MC-94438