Prior to the switch over to the new templating engine, it seems as though Zoho Desk would prerender the Open Graph metadata directly into the HTML of the page. 

This means sites were able to easily scrape the Open Graph metadata and render previews in a straight forward manner. For example, we use Discourse as our community software and it previously did an amazing job rendering a small snippet about the help desk article whenever we link to them. 

Example:

Unfortunately, after we were required to switch over to the new templating system in Zoho Desk, it seems the metadata is not rendered until after the client-side application has loaded (eg. it's not sent across with the base page request). As such, this breaks tools which try to render previews/snippets based on Open Graph data (which don't also implement some sort of more advanced/complex browser emulation/rendering functionality). 

Example: