Why does the cyclic pentazolate anion fail to undergo -oxidization in oxone solution?

When the pentazolate anion (cyclo-N 5 − ) was treated with oxone, a peak of m / z = 86 was detected via liquid chromatography mass spectrometry (LC-MS), which is the same molecular weight as the pentazolate N -oxide anion. After separation we obtained a completely new structure consisting of NaN 5 , sodium acetate, and acetic acid with a confirmed molecular weight of 86 as an impurity peak in the oxone system. The cyclo-pentazolate anion failed to be oxidized using oxone. How can this be realized?