I believe I made a similar post around federation, but I think the issue got fixed really quickly or my eyes glazed over it last time. Neither the front page nor the opened post shows the website the link is to, and you have to open the post and click the title again to navigate to the link. Edit: image was broken because I hemmed and hawed
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I don't know why these link aggregator forums have such a hard time just making the link easy to read. It's really confusing on reddit, hacker news, and like you've pointed out, extremely confusing on lemmy now.
The full url to the article should be in blue text right under the title. That would be the most obvious solution I think.
It should also be more consistent or obvious when the preview will take you to a new tab or just expand an image.