It appears that the facebook scraper has been blocked from ps.w.org.
This causes facebook shares for WordPress.orgWordPress.org The community site where WordPress code is created and shared by the users. This is where you can download the source code for WordPress core, plugins and themes as well as the central location for community conversations and organization. https://wordpress.org/ hosted plugins to not include images.
This is visible in the Facebook debugger as a warning:
Invalid Image Content Type Provided og:image URL, https://ps.w.org/hello-dolly/assets/banner-772×250.jpg?rev=2052855 could not be processed as an image because it has an invalid content type.
https://developers.facebook.com/tools/debug/?q=https%3A%2F%2Fwordpress.org%2Fplugins%2Fhello-dolly%2F
A nginxNGINX NGINX is open source software for web serving, reverse proxying, caching, load balancing, media streaming, and more. It started out as a web server designed for maximum performance and stability. In addition to its HTTP server capabilities, NGINX can also function as a proxy server for email (IMAP, POP3, and SMTP) and a reverse proxy and load balancer for HTTP, TCP, and UDP servers. https://www.nginx.com/. 403 can be seen at the following url, which suggests facebook scraper has been blocked from the CDN.
https://developers.facebook.com/tools/debug/echo/?q=https%3A%2F%2Fps.w.org%2Fhello-dolly%2Fassets%2Fbanner-772x250.jpg%3Frev%3D2052855