Wall of Replica is able to create illusions of invulnerable units, so heroes like Storm Spirit can't just jump through and completely ignore it.

However, the debuff is not placed on these heroes. Only the illusion is created.

1. Cross an enemy Wall of Replica with e.g. Ball Lightning or Time Walk

Result: An illusion of your hero is created, but you are not slowed.

Expected: The wall should slow you, since you passed through it and it is able to affect invulnerable units.