Keep packages away from surfaces or channels that the model instructions say must remain clear. Rear-wall contact can interfere with the intended storage arrangement and complicate the interpretation of wet or frozen packaging.
What the observation tells you
A bag leaning against a cold surface can behave differently from food on the open shelf. Packaging may also divert moisture or obscure a drainage channel. That is a different question from whether the entire cabinet is too cold. Removing an obvious obstruction is a user-level rearrangement; scraping ice or pushing tools into the wall is not.
A useful next step
Check the manual's loading diagram and leave the specified spaces around walls and outlets. Note whether the affected package was touching a surface when it became wet or unusually cold. If the problem persists in the correct arrangement, report that result without assuming the cause is necessarily the thermostat.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.