The Parent pages are no longer showing the links to the child pages. Normally the same links to the child pages shown in the page tree on the left should display in the front page of the parent page. However it is no longer showing those links on the front page of the parent, only in the nav tree.
Are you still using the documentation theme? In that case, there should be a link at the bottom of the page that says "X Child Pages", and if you click on that, then it will show the child pages again.
If you've updated to the newer default theme, then you won't be able to do that anymore. You'll have to put something like this in the footer:
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