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Try putting on a new 1/4 turn shutoff valve. Then have it face down in to a pan. With the shutoff turned off turn the water back on. Then with a new flex supply on the shutoff run water from the shutoff into a bucket. If you have good flow replace the fill valve with a Fluidmaster 400a
It's not uncommon to have debris work its way into the diaphragm and not allow it to fill.
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