Permalink Settings on WordPress: /%postname%.html
The correct URL address of The First page should be: https://domain.com/categoryname (no slash at the end)
The Next Page is https://domain.com/categoryname/page/2
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The current situation is:
In Nav-link, a slash is added to the end of the address of the first page:https://domain.com/categoryname/ (with a slash at the end)
The same problem occurs in the pagination of Category, Tag