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For the OP since you have replaced both the pedal shutoff valve and backflow valve on the 320 toilet I would have to remove the line from the pedal valve going up to the backflow valve and.. with a container gently operate the pedal valve and see if water flows out of the pedal valve into the container..
If Yes then issue is a sticking or deflective backflow valve behind the toilet even though you changed it... OR.. some sort of obstruction where the backflow valve line feeds into the backside of the toilet so that water can flow out of the toilet bowl holes
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