Pick up lava in a bucket. Drop it on the floor elsewhere. Lava flows out from the source block. Pick up the lava again. The flowing lava around it should dissipate since the source block was removed, but it does not.
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Duplicate of MC-4631, please use the search function to see if your bug has already been submitted. Currently over 55% of tickets are being closed as duplicate.
Lava works that way.