[GAMEPLAY] Rek'sai dealing bonus damage to structures

When unburrowed and carrying Ravenous Hydra, Rek'sai's Queen's Wrath is dealing extra damage to structures on the first hit. She should see this bonus damage on units, but I was under the impression it shouldn't occur to structures.

How to replicate: Start a game with Rek'sai. Put at least one point in Q. Buy Ravenous Hydra. Activate Q. Hit a structure. First hit deals base AD + normal bonus AD as applied by the skill.