Yoohoo 👋
So growing in a greenhouse i expect the plants get exposed to the elements and nature somewhat the same as an outdoor grow, just maybe not as severe?
These white trail spot markings really put me in mind of various pests. Whether miners or hoppers... have you seen any bug activity in the greenhouse? Even just briefly?
I would say remove what leaves you can that are affected and then do a neem oil spray. Then watch for any new markings.