Pockets create layered, sheltered areas that can retain moisture differently from the outer fabric. This is a specific uneven-drying observation rather than proof that the entire programme failed.
Understanding this situation
Check the dryness target and the garment's permitted treatment. A tight mixed load or thick fabric can make the contrast more noticeable, while already-dry areas should not be exposed to unnecessary repeated heat.
A useful next step
After normal unloading, use an appropriate finishing method for the damp areas. Describe whether the pattern occurs only with particular trousers or across other suitable loads. Do not raise heat beyond the label simply to dry a concealed fold.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.