Been farming Hellfire for the final leaderboard pushing (season 2) and managed to find a decent Hellfire with a perfect passive. a friend told me to just re roll the secondary for a laugh. thats when i discovered this bug!!! it can actually roll into a 2nd passive! it wasn't visible on re roll possibles but while re rolling the passive showed up as a choice?
So, on a good amulet (that can be better), you "roll the secondary for a laugh", doing it over 200 times to get the extra passive, that nobody ever discovered could roll, and is nowhere stated it can (and since it is a legendary affix, even shouldn't?).
I'm not saying it's not true, but you "defence" vs "fake" makes me a non-believer.
But, It should be easy to check. Equip it on your char and link your profile (worst case we only see 1 secondary roll, if it doesn't show the 2nd passive), or add people in game and link it to them.