This has the feel of a caching issue, which corresponds with the evidence that you can do the following in clearnet browser, and it works:
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Click on image to enlarge. It starts to load, then freezes. We've all seen this and waited.
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Instead of waiting for a long time for the image to finally load, click the image again, and it 'unloads' back to its regular small size.
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Then click it again and it appears right away.
This looks like the DDOS protection layer has a small defect in delivering an image properly the first time it is requested, but it works fine thereafter.
If anon understand things correctly, there is no need for this caching layer in Tor connections. Not confident enough in Tor's privacy to use it enough to even know.
Note, the issue is probably not in 8kun servers or code, but is in the DDOS caching layer from Vanwatech.
This is a tentative programmeranon's hunch, would need to do a number of further tests to be certain, but it "feels" like this is what the issue is.
Not equipped to do anything further than to point this out, others who have skillz can investigate further if they feel like this makes sense.