It seems that this is still an issue - Having Prime rewards from Twitch over ~60 from letting them build up breaks Amanda Holliday's inventory, making them all invisible. This can be seen in: frame drops when viewing her inventory, the Companion App showing her vendor items in full, and IDM doing the same. This has been a bug for over a year. Please fix, or at least throw up a site that lets me hit a big red button which claims them to my vault automatically. This is literally just an issue with her ingame UI.