Squids are able to spawn in a single layer of water, but shortly after spawning they will suddenly take damage, and then instantly die. Doesn't seem normal or healthy for them to spontaneously die like that.
To reproduce:
1. Create a poll of water one block deep, made of all source blocks
2: Spawn squids in the pool.
3. Watch as they are fine for a several moments until exiting the world in a most dramatic manner.
For more info on this bug, and other issues with squids/aquatic creatures check out my recent bugrock of the week episode on this topic:
https://youtu.be/Qt7npxE9UzM
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is duplicated by 3
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It would be good that the solution were some kind of rule that if the water is not deep enough then any kind of squid wouldn't be able to spawn at all.
From studying squid in 1- and 2-block high water with a repeating particle command, and trying different floors, I have found that squid always try to stay at least 1/2 block above any solid block floor. This causes them to stick out of the surface of 1-block-deep water, and then suffocate in the air.
This behavior may be related to a bug in swimming navigation where mobs try to move based on the block below their path (MCPE-45645, MCPE-37229). However, squid do not use navigation.generic like fish and drowned. Instead they use navigation.walk and several squid-specific movement components. For that reason I cannot be sure if it is the same underlying bug.
this bug fix seems to have mostly fixed the issue! but i’ve still had a squid die lolMCPE-114253
Affects all 1.12 updates