[Greg]

I got some help on the bbPress forum and think I’ve sorted this out. I was loading “wp-blog-header.php” for deep integration, but loading “wp-load.php” seems to be better. No more 404 headers in the forum, and the RSS feed problem I had previously is also fixed.

I suspect buddypress.org is using “wp-blog-header.php” because it is showing the same symptoms. Perhaps the admin here would like to try “wp-load.php”.

Thread on bbPress forum:

https://bbpress.org/forums/topic/deep-integration-google-might-not-be-indexing-your-forum-pages?replies=9#post-57859