As the title reads, the automatically generated thumbnail for the automatically generated library link of an "unknown app" is missing for me, or rather not rendered in the oculus desktop library. Specifically only for my Steam installation of No Mans Sky. Curiously in the Oculus Home VR Library it is rendered! See following screenshot:
Deleting and re-adding the link in various circumstances (for example with opt-in into the PTC, or without the opt-in) didn't help me. Also deleting the relevant No Mans Sky files in "C:\Program Files\Oculus\CoreData\Software\StoreAssets" and "C:\Program Files\Oculus\CoreData\Manifests" did not help.
My best theory so far it that somehow the link became corrupted, with no obvious way to entirely purge the knowledge of the existence of the game from the local Oculus App database (after deleting there is still record of the game existing, when pressing the plus-icon in the upper left of the library). I'd like to start fresh so to speak, as if I was starting the game for the first time (as far the Oculus Software can tell), and see if this changes anything, while the thumbnails get automatically fetched again and the link created.
Any of you also having this problem by any chance? Do you know if there is maybe a Registry Key or something I can try to delete?