bbPress.org

If you page’s URL is “xx/forums” and the forum slug is “forum” it won’t appear without the shortcode as they don’t match (one plural, one singular). Also if you add any text to the page (as you have done) then again you’ll need the shortcode. But it should work with the shortcode.

Can you confirm that the site currently has
[bbp-forum-index]

at the bottom, including the square brackets.