Do not treat a cooking cavity as a general storage cupboard. It can be selected accidentally, and heat conditions around neighbouring compartments may differ from your assumptions.
What the observation means
Plastic, paper and other combustible items create avoidable risks if a control is mistaken. A separate storage drawer also has its own restrictions; its appearance does not determine what belongs inside.
A useful next step
Keep cooking cavities clear of unsuitable items and follow the manual's storage guidance. If something has melted or smoked, stop use and allow safe cooling. Do not burn residue away in another cycle or conceal damage before arranging advice.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.