Champion: Nautilus
I found a bug in which you lose gold when you hook a wall as Nautilus after you recall, while being in debt (have at least -1 debt by using the inspiration rune: future's market) Every time you Q (hook) into the nexus (or any wall) to get in lane faster, it says -50 gold and your debt will increase by 50, thus resulting in losing money.
Watch the video in the link to see it yourself.
That's not a bug, it's part of the game. When you enter debt you are charged 50 gold as a lending fee, it mentions it in the details of the rune. I tested in practice mode and could not get it to charge me any more than the initial 50 gold when leaving base (whether walking out, or by using Q).
Make sure to pay attention to the rune's details! 
Future's Market You can enter debt to buy items. The amount you can borrow increases over time.
Lending Fee: 50 gold _ Debt limit: 150 + 5/min_ _ (Debt doesn't become available until 2 minutes)_
