But it uses the favicon as the little image next to the title:
This works for invantive.com, since it takes that URL and adds ‘/favicon.ico’ to the URL, which is the correct URL.
However for the other example, it creates the favicon URL by using the link URL and adding ‘/favicon.ico’, which isn’t the favicon URL used on that page (it’s 'https://invantive.com/favicon.ico' on that page too) and thus creating a broken image.
But strangely enough, it seems in your preview it doesn’t show the broken image anymore, but no image at all, not sure why it chose to entirely ignore the favicon.
Happened just a few minutes after my screenshot, where you can see there’s a missing image (there’s some empty space before the title in my screenshot).