The bug
When squids are spawned in a bubble column, they glitch out and start to teleport up and down.
How to reproduce
Run:
/fill ~7 ~-1 ~-7 ~-7 ~10 ~7 stone hollow /fill ~6 ~ ~-6 ~-6 ~10 ~6 water /fill ~6 ~-1 ~-6 ~-6 ~-1 ~6 minecraft:soul_sand /summon squid (summon like 5)
→ ❌ Squids are bouncing up and down, some even fly out.
Linked issues
is blocked by 1
is duplicated by 12
Attachments
Comments 33
Confirmed for 1.13.1.
Confirmed for 1.14.1 pre 1
Squids are not being pulled down properly in water over magma blocks in the same manner as other water mobs. All other water mobs, cod, salmon, pufferfish, tropical fish, turtles and dolphins are all pulled down into magma blocks properly. This is still an issue as of 1.15.2 release.

Can confirm for 20w11a
Can confirm in 1.19.2.
Issue still present in 1.19.4

Fixed in 24w33a.
Blocked by MC-275413.

Can confirm fixed in 24w33a ✔
Confirmed. Also, they tend to glitch-fly out of water if you are around 40-50 blocks away from the squid (pictures attached) Once you get closer, they exhibit the glitching up/down movement and barely move as described above.
Also seems to affect squid who are over magma blocks. This would make it directly a squid issue I do believe, as they are affected exactly the same by up or down movement?