The above sounds like the known Best Answer / other extension conflict.
I have a suggestion, please: If link preview image returns 404, don't show it... I believe it can be done by simply using
"onerror" inline.
<img src="Error.src" onerror="this.style.display='none'"/>
Although, depending on how this is done, then there would be a blank area... too much left side spacing. So, ideally, the entire image div should be hidden if the image returns 404.
If the link image was on the right, text on the left, then when the image is hidden it wouldn't look bad.
This is better than my previous suggestion of using a default image icon.
And/or, I have realized that a website, like flarum.org, could put restrictions in place. I get a 403 forbidden error with flarum.org links. Maybe Link Preview can have logic that says if 404 or 403, hide image.
