Check the item and appliance guidance. Flexible bakeware can collapse, hold water or shield its own surface if unsupported, even where the material is dishwasher suitable.
Understanding this situation
A folded mould touching itself is not equivalent to an open surface receiving the wash. Its flexibility can also make it move into a spray path or onto another item.
A useful next step
Arrange it using the model's suitable supports without blocking movement. Use an alternative cleaning method if it cannot stay securely open. Describe retained food in sheltered folds separately from a widespread dishwasher cleaning problem.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.