Baby turtles (and I would assume other tiny mobs) get stuck in the soul sand base of bubble columns. It mostly seems to occur in columns only a few blocks high or less. As they bounce around they sometimes fall into the soul sand and remain lodged there, never rising back up or even moving. They do not get stuck if there is no water. This does not seem to be something that is "working as intended". In the second image if you look closely you can see the 3 hitbox outlines in the soul sand. I have not tested this outside this snapshot.
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Also; requesting ownership since the owner of this report hasn’t been online since 2020; they made this bug report... and… then just... left and made no changes. I could keep this report up-to-date with the latest information.

This issue exists in Minecraft 1.19.4. Baby turtles have a height of 0.12 (30% scale factor from adult height of 0.4) which is just under the 0.125 height difference of soul sand.

This behavior still exists in Minecraft snapshot 23w14a.
In 1.18.2.