A sharp tool can puncture the liner or concealed cooling pipework and can slip toward your hand. Ice should not be treated as a surface that safely protects what lies underneath.
What the observation tells you
Even a shallow-looking patch may sit close to a vulnerable component. Damaging the sealed circuit can create a serious hazard and a repair outside the stated service scope. A blunt household tool is not automatically approved either.
A useful next step
Follow the model's defrost instructions and use only an explicitly permitted scraper where appropriate. If ice resists, stop applying force and arrange a controlled thaw or professional advice.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.