adult chickens dont try to swim up, if they stand on a lower slab, and above the slab is a water sourceblock above that another sourceblock. by being partially in the water they start to drown, without rising and eventually hey die. baby chickens are too small to be in the water, so they dont drown, but if they grow, they will eventually die too...
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is duplicated by 1
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Is this still an issue in the most recent versions (currently that is 1.12.2, or the latest 1.13 development snapshot 18w21a) of Minecraft?
Duplicate of MC-9388, please use the search function to see if your bug has already been submitted. Currently over 57% of tickets are being closed as duplicate.