"Builds Into" section bug: Dagger_BotRK

I was going through the shop in one of my games earlier today, and I noticed that when you click on "dagger", the cheapest attack speed item, it shows in its' "Builds into" category that it is used to build Blade of the Ruined King. Now, this confused me, because I thought only items that are directly built by the item selected were in that boxed area. If I'm right, I'm assuming it was just overlooked during the changes to BotRK. I'd appreciate if someone could clarify. Thanks :^) ~FantasticOrange