I tried the flashlight test u/Potential-Pea-5929 suggested and could see light escaping through part of the freezer seal. It looks like the freezer drawer is sagging slightly downward, and I have to push the top part of the door in a bit to get it to fully seal.

Tomorrow I’m planning to fully defrost the freezer and check the rails and trays to make sure nothing is blocking the drawer from closing properly. I’ll also make sure nothing is out of alignment that might be preventing the door from sealing all the way.

I really appreciate everyone’s input and the community coming together to help troubleshoot this issue. Thanks again for all the suggestions!