Shouldn't swtch.toggle() on a group toggle the whole group to one state?

[wsw70]

Consider the group

salon_milieu:
    name: salon milieu
    entities:
      - switch.salon_blanche_entree_gauche
      - switch.salon_tableau
      - switch.salon_lampe_haute

If I switch on (through the UI for instance), say, switch.salon_tableau, and call in my script switch.toggle(entity_id="group.salon_milieu"), each entity of the group is toggled individually.

This means in the case above that I will alternate between 1 or 2 lamps switched on/off as I call switch.toggle(entity_id="group.salon_milieu").

I was expecting a toggle on a group to work similarly to

but apparently, I was wrong.

I can write a smarter toggle function, I just wanted to make sure it is not a terrible misunderstanding :)