Moisture can settle on exposed package surfaces, particularly after opening or introducing wet packaging. The wrapper pattern is a different observation from ice behind a fixed cooling panel.
What the observation tells you
A damp outer bag or repeated rummaging can contribute, but persistent excessive frost still deserves attention. The appearance cannot establish whether the food remained safely frozen throughout an earlier interruption. Avoid repeatedly removing packs simply to compare their frost.
A useful next step
Keep suitable packaging closed, limit unnecessary openings and note when the change began. Use appropriate temperature information and food-safety guidance if thawing is suspected.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.