FBI I did your two changes in the PageListener.php of the extension and cleared the cache, but still Facebook debugger shows:
Inferred Property: The 'og:image' property should be explicitly provided, even if a value can be inferred from other tags.
Missing Properties: The following required properties are missing: og:image, fb:app_id
@JasperVriends, could you please give us an option in the extension to add the fb:app_id also so we can remove this second error too?
I also can't see the image in other social networks. I am not using images from imgur like you but directly uploading and embedding them via the Uploads extension. So will this patch of yours work for those images too?