Some openings serve the oven's ventilation as well as the hob area. Blocking them can affect a function that appears unrelated to the item placed there.
What the observation means
A tray, utensil holder or foil sheet may cover a slot without touching a burner. The opening's purpose should be identified in the manual rather than guessed from its position.
A useful next step
Keep the specified clearances and remove loose obstructions only when safe and cool. Report overheating or changed airflow if it occurred. Do not fill gaps with sealant or install decorative trim that the cooker manufacturer has not approved.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.