Looks a lot like a kitchen sink drain stopper. How it got into the dishwasher is anybody's guess. The proof will be when it fits in the drain basket snugly.
Type your model number in a search engine with the word "parts". A list of appliance parts selling places will pop up.
Most will have an exploded view of your machine, along with a parts list.
Scroll the list's pictures to see if you find that mystery part. Next find it on the exploded view to know where it belongs on the machine.
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