Stinger Missing from Item Sets

This isn't a big problem but I think it's worth mentioning.

When I went to create a new Item Set, I noticed that Stinger was actually missing. If you searched for Stinger with Item Search nothing appears and when you check Trinity Force or Nashor's Tooth , you'll find a blank space where Stinger is normally located in both items.

As someone who plays Kayle and Teemo and only Kayle a lot this is mildly inconvenient for me and I'm sure many people who plays any bruiser that uses Trinity Force might find it slightly annoying to go through the IMMENSE trouble of clicking Trinity Force and then Stinger instead of directly buying Stinger from the Item Set.

Yeah I know it sounds kinda whiny but that's what an Item Set is for right?