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Bug
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Resolution: Fixed
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Minor
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None
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None
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Java(TM) SE Runtime Environment (build 1.8.0_74-b02)
It appears that clients are not sent an update for the world border when the size is set to change over time.
The server is still tracking the border as players are damaged when outside where the border would be. The client renders the border as stationary as it was at the starting position.
This occurs if it's requested via command or by API. Tested in 1.9 vanilla as working. To reproduce in Spigot:
/gamemode creative
/tp @p 0 200 0
/worldborder set 100
/worldborder set 80 60