Lifebane ticks STOP when reapplying lifebane each swing

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I did some testing and realized that the Lifebane ticks stop if you use lifebane every swing.

Some servers it would restart the poison every swing.
Some servers it would extend duration, but allow the ticks to continue every 4 seconds.

On Eden it stops the ticks completely until you stop applying it. The poisons get consumed. The animation fires, but no damage is done.

See below screenshot.

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Is this working as intended or a bug?