Some washer-dryer designs use water as part of their condensing process. Water use during drying therefore needs to be interpreted through the exact model's design.
Understanding this situation
Do not assume that every combination works the same way, especially when comparing water-condensing and heat-pump models. A normal controlled water requirement is also different from an unexplained leak or water visibly accumulating where it should not.
A useful next step
Follow the manufacturer's supply requirements for the selected drying mode. If drying stops after a supply interruption, mention that connection. Do not open hoses or add water manually to reproduce the process or bypass a warning.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.