Permanent high humidity conditions in the enclosure can not only potentially cause problems with a corn snake, but also the environment it lives in (mold growth, etc.) You can easily provide a non-humid extra hide if they wish
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for times when they are not in a shed cycle.
I'm not sure just how much a humid hide raises the ambient humidity (probably depends on the size of the tank, ventilation, the hide itself) but I'm wondering if a snake given the option of a humid hide vs. the rest of the enclosure at all times (drier) would be okay. I don't know if they would encounter high humidity in certain parts of the ground, etc in the wild and use them under normal circumstances. Interesting.