I am joining this request.
It is quite odd when link to post archive is posted on FB, FB collects and displays all info like main page is linked (title, description and image), excepts link itself is not root url but actual archive page. That is very confusing for users.
It should provide specific title and description for that archive and possibly image.
It would be much better if we can separate default image for each post type, or at least to have option that plugin does not set ogg fields in header for selected post type archives so we can deal with it by custom code, and avoid conflicts.