An item placed across the detergent dispenser can interfere with its intended opening or release. Loading position is relevant when detergent remains after a cycle.
Understanding this situation
The board itself must be dishwasher suitable, and its size can also obstruct spray movement or shield other items. Closing the door successfully does not confirm that all those paths are clear.
A useful next step
Use the model's approved position for large items and check the dispenser area before starting. If the compartment still fails to open with a suitable load, report that specific pattern. Do not remove its lid or place detergent elsewhere as a universal fix.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.