Just started a Hardcore campaign. I went through the entire-map, went to all the graves/chests/hunting-spots/graves and interesting points which took me several days.
I decided to do a inventory check after to make sure I didn’t miss anything. Several items were missing, the Quartered Combat Jacket & Dark Milanese Brigandine. Also items had disappeared from my inventory such as Bianca’s ring.
As you can imagine… I’m not very happy since I’m very much a completionist and now I’m wondering if I have to re-do the entire past few days. Do note however, I decided to start a new Hardcore mode to check if certain items were removed from the game in Hardcore mode. Upon checking the Treasure Chests the Dark Milanese Brigandine was in the game. So I can conclude this is some sort of bug.