I found a bug (on Graal v5) in the timer that shows how much longer your trash dash has on cooldown.
This happens if you dash, then switch to a different weapon and wait for the timer to run out. When you switch back to the pencil and dash again, it adds another timer and the old one never goes away.
edit: Nevermind, you don't even have to switch weapons. The old ones persist even if you keep the pencil equipped the whole time.