I don't have any specific technical knowledge of how Lemmy-UI does things, but I'm reasonably confident that it uses the og:title. This is a tag in the site's metadata designed specifically to be the title that displays in places like Facebook and Twitter auto-generated thumbnails, and which is also used in things like Lemmy and Reddit which provide a "suggested title" to users.
this post was submitted on 12 Apr 2024
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Ah, so the problem is with how some sites configure (or fail to configure) their metadata, rather than a problem with Lemmy?
Could be. Though Lemmy could also use the title property (the one users see in their tab header) as a fallback option if it wanted to, or some other fallback.