The Bug:

Turtles can still move despite having their movement speed attribute set to zero.

Steps to Reproduce:

1. Summon a turtle that has its "minecraft:generic.movement_speed" attribute set to "0.0" by using the command provided below.

   /summon minecraft:turtle ~ ~ ~ {Attributes:[{Base:0.0d,Name:"minecraft:generic.movement_speed"}]}

2. Tempt the turtle by holding some seagrass in your hand.
3. Watch the movement of the turtle closely.
4. Take note as to whether or not turtles can still move despite having their movement speed attribute set to zero.

Observed Behavior:

Turtles can still move.

Expected Behavior:

Turtles would not be able to move.