If I create a new blog post in wordpress with an oEmbed link on the first line e.g. youtube, the widget appears and works correctly in both the single post page and in the BuddyPress activity.
But when I create a new forum topic/reply with the first line as a youtube link and some text below it will work in the forum view but in buddypress activity there is only the text present. No widget or even a fallback link.
I don’t know if this is a bug or I am just missing the bigger picture but our site depends quite heavily on oEmbed now since it is an easy way to get widgets into the activity stream.