Gangplank's Q and Titanic Hydra interaction bug

Noticed an odd interaction with Titanic hydra, Gangplank's Q, and Powder Keg. So I first noticed the normal interaction is that his normal attack originates from himself. Which it should. His Q target hits then the Titanic Hydra passive fires. However the passive does not fire correctly if he uses it on a powder keg. Attached are 3 screenshots, the first one shows the Q with the titanic hydra firing from his Q correctly. The second one shows that the titanic hydra fires from the base of his model. The third one shows that the Ravenous Hydra fires correctly off of his barrels.

This happens with at least sailor, and toy soldier. Assuming that this is an actual bug with the interaction. When used with minions in between the keg and Gangplank, it does kill out of range of the barrel, but in range of the hydra from the base model. (Which means it is not just a visual bug.) Of course I couldn't accurately capture this issue, and for that I apologize.

If more info is needed please let me know, and I'll reply in kind.

(PS Tiamat(?) does work correctly.)

Updated with requested picture of gangplank hitting the minions in a way that the barrel could not reach nor could his autoattack reach.