You should measure the plywood by putting your ruler down into the gap so
that it touches the top of the joist, then measure the thickness to the
surface. I am sure it will measure close to 3/4".

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If it was 24/32 then it would be exactly the same as 3/4. So 23/32 is
just 1/32 thinner than 3/4 and a big difference from 1/4.