BuddyPress.org

Thanks for your reply, @andrea_r

If so, why re-activating buddypress plugin makes a blog that the user belongs to show up in his/her “My Blogs” and listed in his/her “Blog Directory”?
I do not remember when, but the old (previous) buddypress immediately showed the site blog in “My Blogs” of the user who is a member of that blog.

It is weird that the user can post in the blog that is not shown in “My Blogs” nor not listed in “Blog Directory”, isn’t it?