rehumanizing while Unchanging

rehumanizing while Unchanging

When hero poly'd into paper golem "burns completely" he is rehumanized
even if he has the Unchanging attribute.  A comment states that that is
intentional, but there was no explanation given to the player.  Report
that "your amulet of unchanging failed" when rehumanization despite
Unchanging happens.  (Don't ask me how or why it fails; I don't know.)