/kill (specifically /kill @p) will display a message saying that you fell out of the world. This applies only to the 1.9 snapshots.
MC-87497
/kill will display an improper message
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That's what /kill does, if gives void damage, if you die of void damage you get the death message fell out of the world, this has always worked this way
It happens in all versions, it's just the death message, there are 2 messages send, command feedback, and, in case of a player, a death message