Assets disappeared from windowsUI kit while scrolling in XD.

I'm not sure why but the asset list in Adobe XD keeps disappearing assets in the list. Just opening the WindowsUI.xd file (which is available on the Microsoft website) and scrolling up/down initially I can see everything but it seems that if I click away from the WindowsUI document screen to any other application on my desktop and switch back, then most of the assets in the list disappear. 

Although this is demonstrated in the attached video by opening up a new XD document it happens even if I switch to another application and switch back. I've done this multiple times, and in my case, it's repeatable every time. 

Is this a known issue or is there something I can do to prevent this?

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