When emptying a water/lava bucket onto a block that has a water/lava block on it already, whether it's a source block or the runoff, it causes that water/lava block to break, and be replaced by the new one.
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Duplicate of MC-18365, please use the search function to see if your bug has already been submitted. Currently over 58% of tickets are being closed as duplicate.
When I say break, I mean it causes the particle effects and sounds of a block breaking