An edge chip can affect a component exposed to heat and mechanical stress. Its small size does not establish that continued use is safe.
What the observation means
A surface deposit, scratch and missing piece are different observations, but the owner should not press on the glass to test its strength.
A useful next step
Stop using a chipped or cracked hob and obtain assessment with the model details. Keep a safe photograph if available. Do not fill the area with resin, tape or sealant, and do not assume an undamaged-looking zone elsewhere can be used independently of the affected glass assembly.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.