Hey bro! Leaflets are pests. Neem oil will help, apply it three to ten times! Usually, the parasites don't retreat after the first application! Good luck! You'll beat them! 💪
Looks like you have a leaf miner pest.
Here is a link containing info on this critter and how to take care of the problem.
https://www.royalqueenseeds.com/blog-how-to-identify-prevent-and-treat-leaf-miner-invasions-n574
Hope this helps. Happy Growing! 🤟😜