No blanket assumption is safe. Some faults are confined to one function, while others can involve shared controls, supply or cooling.
What the observation means
An electrical trip, gas concern or overheating requires particular caution even if another oven appears to work. A repair business needs the full symptom before advising on continued use.
A useful next step
Describe all affected functions and ask for model-specific guidance. Do not keep testing combinations to discover which one avoids the symptom. Leave the appliance unused for hazardous signs, and do not treat a working neighbouring cavity as proof that the whole cooker is safe.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.