I couldn't send it here... I'm new and don't understand much yet, but I uploaded it as a new plugin to my account and gave you the credits. Thanks!

Hi!! Arsalan Shah, thanks to you sharing your plugin, I made a small improvement by adding infinite scroll. Additionally, for unregistered users, it redirects them directly to /wallposts, and for logged-in users, it automatically redirects them to /home.

Thank you very much. It only works if I share it like this: example.hu/wallposts. Not working: https://example.hu/wallposts.

You need to post again. Debug it here https://developers.facebook.com/tools/debug/

Does it appear properly on Facebook? I still have a blank white image.

Working fine

Now this is what the end of the file looks like, and yet there is no preview image, although if I open the link, the image appears there.
echo '</div>';
?>
<meta property="og:image" content="https://webpage.hu/viev.jpg"/>

On that post there are many images what image you wanted to add?
Simply edit view.php of this component and add at end

?>
<meta property="og:image" content="https://path to image" />

I think an image is needed when the mydomain/wallposts post is published on Facebook.

Works great with OSSN 5.6 too! Many thanks Arsalan!