Only if the model's instructions expressly allow it. Rapid preheating may use a combination of heat sources that differs from the cooking mode chosen afterwards.
What the observation means
The aim of a rapid-heat function is to bring the empty cavity towards its target promptly. A delicate surface or exposed topping may be affected differently while that process is taking place. A tone or display change may indicate that the oven is ready, but the required transition back to the cooking mode is model dependent. A timer alone does not establish that preheating has finished.
A useful next step
Check whether your oven changes modes automatically or expects a manual selection. Keep this detail with a report of scorching that happens only at the beginning of cooking. If rapid heat never completes, note the displayed target and any message without repeatedly restarting the function. Compare the instructions before assuming that a different preheat duration means a component failure.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.