Do not hide a chamber full of old scraps under a fresh load. Keep the appliance switched off and consult the approved cleaning and inspection procedure for the exact model first.
What the observation tells you
Visible food at the sink opening does not show how much material is below it or whether a utensil has fallen in. Avoid reaching through the opening, using drain chemicals or packing more waste down to force it through. Smell alone cannot establish that the mechanism is clear.
A useful next step
Remove only loose material accessible on the sink surface with the appliance safely isolated. If the chamber cannot be checked or cleaned by an approved owner procedure, arrange service.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.