Whenever a squid swims into a kelp it will fall through it and take fall damage as though there were air there. (in the second image look in the middle just above my HUD). They then proceed to suffocate.
MC-125191
Squids fall through kelp
Resolved
Duplicate
0
Oscar Vitou
(Unassigned)
Unconfirmed
Minecraft 18w07a
Retrieved
It is also the same with the player. If the player goes into it, the player drops down.