I have changed the category from
"file-recovery" -> "zip-file-recovery"
to
"file-recovery" -> "archive-and-backup-file-recovery" -> "zip-file-recovery"
However, after that, I find for the same post, there are two kinds of URLs that can access it. For example:
Old structure: https://www.datanumen.com/blogs/category/data-recovery/file-recovery/zip-file-recovery/page/3/
New structure: https://www.datanumen.com/blogs/category/data-recovery/file-recovery/archive-and-backup-file-recovery/zip-file-recovery/page/3/
Both pages will set the new structure URL as the canonical URL. But when visiting the old structure URL, it will NOT be redirected to the new one.
Is this designed by purpose? And if that is the case, if I change the category for 10 times, then there will 11 copies of the the same post?