Sorry - I said ‘you seem focused’, when I should have said something to include the other replies in this thread - I just meant there’s a lot of stuff here about adblockers, when you’ve established for yourself that it’s not that, and it’s drowning out the actual answer.
I did expand your spoiler tag - I read that you’d cleared ‘Browsing History’, but that’s a different checkbox than ‘Cached images and files’, so I didn’t know if you’d already done that.
Ultimately, this problem is why instances are usually quite ‘grabby’ when it comes to images that federate across - they tend to make a copy and host it themselves. For whatever reason, feddit.nl isn’t doing that for images on here, and startrek.website isn’t always quick enough to provide it when a page is loaded, so the local cache ends up with a broken image. So clearing the cache and reloading the page will often fix it, but it’s not a 100% solution, and the results will differ by user. I would suggest that the real solution is for startrek.website to upgrade their server, or for its members to host images on a site that is dedicated to serving them.
EDIT: another solution would be to leave feddit.nl, and join startrek.website (depends where you priorities lie, of course)
Wow, yeah. I just viewed Risa from Brave and it’s a wasteland of broken images.
Here’s how I fixed it though: Brave=>Clear Browsing Data=>Tick ‘Cached Images and Files’=>Click ‘Clear Data’. Once I did that, everything loaded normally.
You seem focused on the idea that it’s to do with adblocking or shields, and it’s not - it’s related to caching.
Oh, well, it might be about the issue that the OP makes in a comment on that post.
For me, the URL of that image is startrek.website/…/ffcc19ac-fb10-4c66-893e-87840b…, which is different from the one in your screenshot.
Viewing feddit.nl/c/risa@startrek.website in Private fixed the thumbnail for me in Normal view, so it suggests it’s a caching issue. Perhaps try to purge your browser’s memory of the community, and see if then comes up with the correct URL.
The post you’ve linked to (referring to the problem being ‘wacky local caching’) explains some of it.
For example, that “TRUST ME. That TV? It’s Safe” post - the thumbnail is broke for me on feddit.nl, but it points to a valid image (it expands to a full one, and ‘Open Image in New Tab’ will display the thumbnail version.
If, however, I view the community through Private Browsing (aka Incognito Mode), the thumbnail displays correctly.