In villages the water in the farms can pass through the wooden blocks.
It doesn't create a new source block on the other side of the wood block, just carries on flowing through it, if you walk/swim through the strange water, it's still normal water (i.e it is there, it's not just a weird minecraft mirage )
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Duplicate of MC-11280, please use the search function to see if your bug has already been submitted. Currently over 54% of tickets are being closed as duplicate.