Item attribute slot "all" not working

Hey, im having a problem with mythic mobs items. I want to make an item who give a attribute to the player when in the inventory (all slots).

So, i made that :

RingSpeed:

Id: 370

Data: 0

Display: "&6&lL'anneau de vitesse"

Lore:

• '&r&7Un des deux anneaux elfiques'

Attributes:

 All:

   Health: 2

Its not working, and its only with "all" for slots. Im on 1.12.2 and im using an old version of mythic mobs (4.2.0). I already try with newer versions but still not working. Any idea ?