THE VERSION IT'S 13W01B! (not listed)
When having a block of water on the middle of walls and destroying the non-flood block and placing a sign in it, it will generate a new water flow (sorry my bad english).
Images are step by step.
Think just affects this version. Didn't tryed in other versions...
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Duplicate of MC-5770, please use the search function to see if your bug has already been submitted. Currently over 42% of tickets are being closed as duplicate.
Version 13w01b is no longer listed, because it's out of date, you should always try to reproduce bugs in the newest version.