Not necessarily. The source may involve a leak, fixture trap, ventilation arrangement or another issue. A filter is not present or serviced identically on every unit.
What the observation means
Masking a smell can hide a problem that needs attention. Do not open the casing or cap ventilation to investigate.
A useful next step
Describe the smell's location and timing with any drainage change. Follow only model-specific owner maintenance. Seek assessment for persistent odour or visible leakage, and do not assume an aftermarket filter or fragrance will make an uncertain installation safe.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.