I think there's a bug with the display of saved favorites. As when you go to "My Libraries" and into the folders, there's a count for the (no. of images saved) but nothing displays. Everything is just blank, with the exception of 'downloads'.
This is in Chrome Web browser - Version 88.0.4324.104 (Official Build) (64-bit)
Same result in Firefox browser - 85.0 (64-bit)
This is not a bug. The Adobe Stock Libraries will only display Adobe Stock assets in the library. In your example you have 0 Adobe Stock assets in that library but 214 other items. These other items could be brushes, swatches, or other Creative Cloud items. To view all contents of a library visit https://assets.adobe.com/libraries