Anim montage multiple slots and looping

I want to setup a montage with 2 slots, one fullbody one upper body.
I have a section overlapping both, first animation is on fullbody, the second is on upperbody and looping.

I cannot get the upperbody animation to play, they are still playing on fullbody even if there is not animation in the fullbody slot.

Is it even possible to do waht i am trying to do ?
How are multiple slot in anim montage are supposed to work ?

I couldnt find any answer, only people asking questions without any answer… hopefully mine don’t get in that pile.

thank you.

I may have the same problem, did you found a solution ?