In our Windsport we had a problem show up when emptying the holding tank. There was a circle of floor tile that had been dropped in the holding tank after cutting the hole to install the toilet during build. It released when draining and blocked the valve making it impossible to close the valve. Had to use long nose pliers to dislodge it from valve and remove it. We had trouble getting everything out from the ledge when emptying tank prior to this. Realized after the floor tile circle blocked valve that we had seen the circle sitting on the ledge you described. Don't understand letting it fall in the holding tank and not removing it before in talking toilet.
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