Usually an indicator relates to a particular function or control arrangement, so its meaning must be checked for the model. It is not a universal whole-cooker health signal.
What the observation means
A lamp may cycle during temperature regulation or indicate a selected element. Another cavity can have a separate lamp or none at all. Comparing their lights without checking the design can be misleading.
A useful next step
Identify the indicator's purpose in the manual and report the affected cavity's actual result. Do not assume a lamp that goes out means all heat has stopped, or that an illuminated lamp proves the food is receiving the intended heat.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.