A crowded tray can leave contact surfaces sheltered and may interfere with the rack arrangement. The designed slots and spacing matter more than the number of pieces that can be stacked there.
Understanding this situation
Large utensils may require another approved position, and sharp items need safe orientation. Forcing the tray shut can also alter clearance above the upper basket.
A useful next step
Arrange suitable pieces according to the manual and split the load if needed. If washing remains poor, note whether residue is confined to touching surfaces or appears throughout. Do not remove tray components simply to force in more cutlery.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.