Megacity posts : Include all posts from boroughs

What I was trying to do:

See all the posts to my megacity

What I expected to happen:

seeing posts of all the boroughs of the mega city

What actually happened:

seems that I just see some past posts to my megacity directly…

In Megacity, the posts of all boroughs need to be seen in the Megacity page and not only the posts assigned to the Megacity (which in real life, should not exist since posts are attached to the boroughs)