It worked when I used it with a hook
That seems to be a bug. could you send me your save file?
chikubiattack@gmail.com
Save files location :
C:\Users\ (USER NAME) \AppData\LocalLow\ChikuAtta
Also, you can find your crossbow on the upper floor of the stage. You should find a key, or just get mouthpiece and armbinder and run into a goblin. He will lead you to upper floor.