Since yesterday no one of our og:image meta is correctly crawled by facebook. We both receive an odd "unknown" error when we try to debug the preview link through the facebook link debugger. Everything is passed og:image included and since yesterday everything worked fine but now we can't have ay preview for any of our link.

Any know ongoing issue on the facebook side? Any new requirement added recently?

Thanks in advance for your kind support.

Filippo Ronco Genoa, Italy