Do not interrupt a hot drying stage to add wet items casually. The model's safe pause instructions and the garments' treatment requirements must both be followed.
Understanding this situation
Adding saturated pieces changes the load and can mix substantially different moisture levels. A sensor programme's earlier estimate may no longer describe the new combination, and an engaged door lock is not an obstacle to be forced.
A useful next step
Finish or pause only as documented and keep within the drying capacity. Where appropriate, process the hand-washed items separately using their permitted preparation. Never wring or drip water over electrical controls while trying to load a connected appliance.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.