Isn't it sealed? Where are they gonna go?
Strains are what, < 5% terpenes? Usually < 2% by weight? I imagine them boiling off and sticking to the decarb chamber, and then they are left behind when you transfer into a new container to infuse. That's the allure of an in-place oil decarb/infuse in a small mason jar: the terpenes boil off into the oil and stay there.