Sorry for your loss if truthful KoksSucht. I fear that you're not trolling this time, as it is very likely that it could off happened like you said.
As people ask me how it happened, this was something I haven't seen before. My guess is me and ferdia were extremely unlucky. I hit exit at the 5 min window where nothing was saved :~B. Ferdia left/got kicked just when servers started saving again~~ t4t blitzz.
See post by blizz rep; battle.net was in a state where characters couldn't save. Ferdia probably exited when the server DID save again. RIP.
https://us.battle.net/forums/en/bnet/topic/20759627777?page=3#post-42How it happened; In case you wanna avoid replicating. But this was fairly random. What u can do is make sure both traders leave game INSTANTLY after trade. that way in case off non-saving you will atleast both get the items back and avoid any loss/dupes.
Quote
Im char a, he char b. Char a has item X, char b has item Y.
Char a create game. Char b enters. Char a+b trade successfully.
Char a now has item Y, char b has item X.
Char a leaves game, joins with char c. Shows off some itemmys.
Char c leaves again. Gets kicked of b.net. Servers are down.
Do not know if Ferdia exited game or got kicked with realm down.
Blizzard are toying with our butts

TL;DR:
Quote (Mayrankorpi @ 6 Dec 2017 03:44)
Every single time blizzard "fix 1 thing" they fuck 2 things.
This^
This post was edited by SpAz. on Dec 6 2017 05:38am