Different materials and shapes can finish with different amounts of visible moisture. A few plastic items remaining wet is therefore not identical to the whole dishwasher losing drying performance.
Understanding this situation
Check their dishwasher permission, position and the model's drying programme. Lightweight items that overturn or containers with deep recesses add loading-related reasons for retained water.
A useful next step
Use the supported arrangement and finish items appropriately before storage. If ceramics and other suitable items also show a new widespread change, report that broader result. Do not increase treatment beyond the plastic's care limits simply to match a plate's finish.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.