The issue:
When squids swim around, they raise out of the water (1) and when they are near a block a the surface, they get stuck (2) out of water and die of suffocating (3).
This phenomenon happen often when you make a water themed town or server leaving ink sac on the ground.
How to reproduce it:
This happen naturally, so you can create a pool with water high as the border and summon some squid and wait few minutes.
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This report duplicates MC-132473.
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