Relic item disappeared from main inventory
For me, the weapon never returned. An Exitus rifle disappeared in the last step of fusion 72-100%. I collected new Exitus and fused 100% successfully. Later it happened at some item, I don't remember which one. It's random.
may we ask even after a full game restart hasn't the item appeared? In case of item disappearances they should be put back automatically. You may find it in your inventory please check on it!