A protruding bag can interrupt the seal even when the main food load fits. The opening may be small enough to escape notice during a quick glance.
What the observation tells you
Moist room air entering through that gap can create a local frost pattern. Pulling the bag free by slamming or forcing the door risks tearing it or damaging the seal. Ice already present may require the model's proper care process.
A useful next step
Rearrange accessible packages so nothing crosses the sealing surface. Check gentle closure and record whether frost returns. If the seal is damaged or closure remains poor with contents clear, seek assessment.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.