There are two cases where you can have broken links
1. The index is not entirely updated - you have changed the name of some posts
2. BlogPosts page - the page which you have set when your blog is created is not correct. By default this should be the page on which you have BlogPosts control. This page is used by BlogIndexProvider to construct the url of your posts. When this page is wrong, the urls of the posts are also wrong.
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