Invisalign Mid-Treatment Overcorrection Inquiry

In the middle of refining my lower arch, however started seeing signs of relapse/residual gap on my top arch due to a loose contact but the passive trays are helping maintain the contact for now as we resolve the bottom. I requested my dentist to order over correction trays for upper arch to prevent further relapse but got told it will require a new clincheck which I’l have to pay for again. Can anyone confirm if this is accurate or is it possible to order it mid-treatment on the same plan?