Why shouldn't a State being able to rescind a ratification or an application? If a proposed amendment has yet to receive ratifications from three-fourths of the States, a State should be able to rescind its ratification thereof. Less than two-thirds of the States have applied for an Article V Convention, so rescission should be allowed.
As for silence on this matter, see the 10th Amendment.
In 1868 the states of New Jersey, Ohio and Oregon rescinded their ratifications of the 14th Amendment. New Jersey re-ratified it in 2003; Ohio also re-ratified it in 2003 and Oregon re-ratified it in 1973.