The bug

When you try to get the NBT tags of axolotls with /data command, you can see the "Attributes", but these isn't most attributes, except follow_range and movement_speed, you can only get values of other attributes by running /attribute command.

How to reproduce

1. Summon a axolotl
2. Get the attributes info of the axolotl with /data command

   /data get entity @e[type=minecraft:axolotl,limit=1,sort=nearest] Attributes
   

   → You can only get the values of follow_range and movement_speed.

3. Get other attributes info of the axolotl with /attribute command.

   /attribute @e[type=minecraft:axolotl,limit=1,sort=nearest] minecraft:generic.attack_damage base get
   

   → You can get the value of attack_damage of the axolotl, but you need to edit the command to get the values of other attributes.