Ender dragon model and hitboxes do not scale correctly with the scale attribute

Enderdragon overall hitboxes grows, but the entity and it's individual smaller hitboxes do not

How to reproduce

1. Summon an ender dragon

   /summon ender_dragon
   

2. Apply a scale attribute

   /attribute @e[type=ender_dragon,sort=nearest,limit=1] generic.scale base set 8
   

3. Notice that the ender dragon does not grow in size
4. Press F3+B to show hitboxes
5. Notice that the overhitboxes is bigger, but the smaller sub-hitboxes are not