Upon new link posting, Pleroma not re-reading the Schema.org/Twitter cards/Opengraph
I do not know which one of those three or any of those uses Pleroma, maybe Schema.org, maybe Twitter cards, maybe Opengraph.
I have noticed that if link is posted with missing image in one of those, pleroma still tries to show the image, but image is missing and it appears like broken image, look here: https://pleroma.gnusocial.club/notice/9m4yQAdFkDsC2DnSpk
Now if the link is posted again, pleroma is not re-visiting the link, to verify if the image is there. So it appears again broken even if the image is there.
I am speaking of the image that can be found inside of the HTML:
<meta property="og:image" content="https://gnu.support/images/2019/08/2019-08-20/1536/2019-08-20-August-Di-12-29-06-273631238.jpg"/>
And I am using Twitter card, Opengraph and Schema.org
Proposal is that if the image is not there, it should not then appear on the notice as a broken or missing image. And it appears that html file or link is given on the place of the image.