preview image for links not shown correctly for Pleroma/Akkoma instances (with no mediaproxy)

[kimusan]

I noticed that image preview for toots seen from an akkoma/Pleroma instance account are broken

The same post seen from a Mastodon account shows the image just fine:

The image seem to be there just fine but for some reason it does not get loaded:

From Akkoma instance (seems like no media proxy is enabled:

<img alt="Pass the eWPTXv2 Exam on Your First Attempt in 2023! - Pass the eWPTXv2 Exam on Your First Attempt in 2023!" w-full="" h-full="" object-cover="" class="" data-src="https://hashnode.com/utility/r?url=https%3A%2F%2Fcdn.hashnode.com%2Fres%2Fhashnode%2Fimage%2Fstock%2Funsplash%2FzvHhKiVuR9M%2Fupload%2Ff65d2a6592f6b0ddaf803bcdc59c73af.jpeg%3Fw%3D1200%26h%3D630%26fit%3Dcrop%26crop%3Dentropy%26auto%3Dcompress%2Cformat%26format%3Dwebp%26fm%3Dpng" data-sizes="auto" loading="lazy" sizes="96px">

from mastodon (where media proxy is enabled):
<img width="400" height="210" alt="Pass the eWPTXv2 Exam on Your First Attempt in 2023! - Pass the eWPTXv2 Exam on Your First Attempt in 2023!" w-full="" h-full="" object-cover="" class="" data-sizes="auto" loading="lazy" src="https://social.data.coop/system/cache/preview_cards/images/000/456/129/original/0ea1d7aba269a353.jpeg" sizes="516px">

I wonder if it is some CORS/CSP mismatch that causes this?

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[dragon2611]

This also seems to be the case when media proxy is enabled but uses a different domain to the akkoma instance.

[kimusan]

tried enabling media proxy for the akkoma instance but still see the problem - domain is the same

[leopku]

Same Issue as #2172.

Mastodon A.P.I compatible backend PocketRSS with no media proxy.

PS: videos works fine.