SOLVED: Not able to download artwork today

[Host-in-the-Shell]

I'm still having issues downloading images, and currently see the following message being spammed in my logs:

Code:

[2024-12-08 15:46:02.333 -04:00] [ERR] Error refreshing item
System.ArgumentException: Guid can't be empty (Parameter 'id')
  at Emby.Server.Implementations.Library.LibraryManager.GetItemById(Guid id)

At some point I was able to successfully add new media and get the proper metadata, and search for images again, but it went back to not working.

Edit: It suddenly started working again; no idea what's going on.