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.
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To further prove my point, here's screenshots of the app, DIM, and then the game - items showing in the former two, but not the latter. https://imgur.com/a/yULUFDa