CC Library previews lost when edited in CC2021 or CC2022
(cross-posting this from the Illustrator discussions based on the suggestion of Ton Frederiks)
Working in Windows 10 Enterprise and various CC versions of Illustrator.
As of a week or two ago, library previews of images recently edited in CC2021 and CC2022 are lost (general CC logo appears instead).
The one on the bottom is the original image. The others are edited and saved in CC2020, CC2021, and CC2022 this morning. Until a couple of weeks ago, previews of edited library images were fine.

These appear similarly in the CC app:

So far, I have tried the following:
- Completely uninstall a recently updated extension (same result)
- Sign in and sign out of Creative Cloud (same result)
- Completely uninstall CC2021, including prefs, reinstall, and try editing the image before making any changes to the re-installed Illustrator (same result)
- Sign out of Creative Cloud, use Task Manager to kill all CC processes, restart the computer, sign back into Creative Cloud (same result)
Note that this occurs with any library image I edit. Additionally, I just now tried adding new artwork to a library with the same result (no preview image is generated)
Since the previews are also not showing up in the CC app, even though syncing seems to be working fine. I guess these two versions of Illustrator are no longer generating a library image preview, which is reflected in the CC app.
Any other ideas on how to fix this would be appreciated.
Thanks
