I'm sorry for the delayed response. I initially started investigating this after your post, but didn't have many answers right away. We've been investigating some more since, and hopefully the below information helps.
The link you posted above doesn't work for me either. It shows "Error parsing input URL, no data was scraped." However, in the URL input, if I simply remove the 's' in https and try again, the URL properly works. The Debug tool properly follows the redirection from http:// to https:// and the results output as expected.
After that, I copied the "Canonical URL" and put it in the debug tool to test and that seemed to work.
So, there's something strange going on with the URL you posted with the direct link to the debug tool, but I'm not sure what it is. From testing though, I can get the tool to properly show the results though, so it *seems* like Facebook is able to scan your page.
I hope that helps get you started. Please test and see if you have the same results. We've never seen this type of problem before, so we'd love to hear if you can recreate what I've said seems to be working.
Thanks,
Alex