wonderm00n, first thank you for this plugin. Second, I am running BuddyPress and bbPress. Your plugin IS generating the OG tags for me, just as your post shows. The major issue I have right now (and would be of no use in helping you solve) is in the og:description and name:description tags. The excerpt it takes to build the description includes all of the bbPress breadcrumbs and reply meta information, and misses the actual post content.
Is there anything we can do about this?
Example post on my site: https://churchtechconnect.com/discussion/topic/forum-structure/