Stagnant air can create moisture spots within the buds even when drying.
You can then get cobweb like mould forming on the outer parts of your bud if it’s too cold, too humid and not enough air moving in your drying area.
If you are exhausting your drying area then no real issue as air will be moving through the area.
if your drying area is closed off then a small oscillating fan somewhere in the area helps to stop stagnant air creating the cobweb like mould.
I use a small USB fan well below my drying racks just keeping the air moving.