The post you linked to doesn't have a thumbnail returned from the lemmy.world API. Were you viewing that post through another instance of Lemmy that happened to pick up a thumbnail?
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I'm using lemmy.world on both apps. Some screenshots comparing the apps:
I'm not sure then, that would be a question for those app developers. The thumbnail URL doesn't exist in Lemmy's API. You can see the same behavior in lemmy-ui.
One of Thunder’s settings is to “Scrape Missing Link Previews.” I’m not a developer, and not too savvy when it comes to this stuff, but just throwing that info out there in case it has anything to do with OP’s question.
Hmmm. So the app is making a request to the website by passively scrolling through the feed? That seems pretty bad for security/privacy reasons. I'd much rather see the missing thumbnail scraping fixed in Lemmy. And then it will work in all apps, and not have privacy issues.
Edit: I made an issue: https://github.com/LemmyNet/lemmy/issues/4468
It seems that what first was a Voyager question became a Thunder investigation. I'll ask in the Thunder community what is happening here.