Not a bug, but please update the tool tips of these two or three items.

The two Hydra items are still restricted to melee only champions but in the client's item set builder there is no mention of this at all even though in some previous patches this was the case. Please update their information to include the melee only restriction.

I don't recall if their component item Tiamat is also melee only, I suspect so, so please also look into that one as well.

It's sad you can't get basic tool tips right Riot.