I dunno if this is a bug so much as an unfortunate side effect of the “clearing” mechanism for ground items. I just killed Avarice and like 10 goblins jumped out, which was fun and exciting. The problem is, they dropped so much loot, the two treasure bags I KNEW were there were gone. There were probably like 10 more from the other goblins. But, since they are yellow, the game deleted them. Not in stash, not in inventory. Disappeared with all the other yellow items on the ground 
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Same thing happened to me. After avarice was killed and the goblins spawned and where killed, i was only able to pick-up some legendaries cause all the other items just dissappeared “into the ground”. All was lost.
I had a similar problem: killed avarice, killed the goblins, took some legendaries then teleported back to town to empty my bag and when I teleported back all the items were gone except 3 who were in my stash. So I lost dozen of legendaries and multiple treasure bags.
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I dropped the Gilded Horn mount trophy and it vanished 