I obtained the last reward in the seasonal (Chaos) tree, and when the mythical item dropped after I opened the reward, I went to pick it up, and it dissappeared. it is NOT in my inventory anywhere, and I did not see it at Shaya, as an accidentally sold item. (Not in buyback). Not in my stash either when i checked there an hour later.
I worked hard earning this rep, please find my missing item and return it. I don’t even know what it was, beyond a purple colored mythic drop - on my Spiritborne.