Summary:
Axolotls and turtles, when spawning in Java and on full blocks in Bedrock, immediately go to the nearest water. On incomplete blocks (slabs, mud, pressure plates, etc.) in Bedrock, they often walk in different directions or stand before going to the water.
This behavior does not apply to dolphins.

Steps to reproduce:

1. Place incomplete blocks next to water.
2. Summon the axolotl or the turtle on it (repeat this several times).

Observed results:
Axolotls and turtles do not always go immediately into the water on incomplete blocks.

Expected results:
Axolotli and turtles always go immediately into the water.

Video:
MCPE-165140.mp4