Check the specific accessory instructions. Being removable for cleaning does not automatically establish that a rubber baffle is suitable for dishwasher heat and detergent.
What the observation tells you
The approved cleaning method can differ between parts that look alike. Do not place a component in the dishwasher while its identity is uncertain, and do not wash a control stopper as though it were an ordinary drain plug. Any damaged or distorted part needs assessment before refitting.
A useful next step
Safely isolate the disposer for approved removal and follow the stated cleaning and refitting method. Keep the appliance unused until every required protective accessory is correctly back in place.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.