It may use a controlled preheating stage intended to establish conditions in compatible cookware. The signal has a specific purpose defined by the model.
What the observation means
Adding food early changes the load, while waiting too long after readiness can also differ from the instructions. This is not the same as manually running boost.
A useful next step
Follow the programme and pan guidance precisely. If readiness never appears, note the pan and display rather than extending heating indefinitely. Stop for smoke or abnormal behaviour, and do not use the programme with an unsuitable empty coated pan.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.