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 duplicated by
Attachments
Comments
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

In 20w12a

In 1.16 Pre 3

In 1.16.2 Pre-1

In 20w46a

Can confirm in 21w03a

Yes, and applies to glow squid as well

In 21w05a as well

In 21w10a

Still in 21w11a

Confirmed for 21w13a

In 21w14a

In 21w15a

Confirmed in 21w15a

Per MC-223590, it seems this may occur with axolotls as well.

@Brevort I tested this in 21w15a, but I could not find this behavior in axolotls, just the squids.

In 21w17a

In 21w18a

Confirmed in 1.17-RC-1

In 1.17

Can confirm for 1.18 Pre-1
[media]
Affects 22w05a
Can confirm in 1.18.2 and 22w16b.
Can confirm in 1.19.
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?