Help with the Classic editing function

The Classic Editor functionality is not working. I can’t edit pages created before the move to the Block editor with the Classic Editor nor create a new page with the Classic Editor. When I save the page it changes the Title and the permalink to the same title every time.
It is on a reinstalled 5.6.2 . I have disabled all the plugins and used the Twenty Twenty theme then enabled the Classic Editor. Is the Classic Editor is part of core functionality?
I posted to the Classic Editor plugin forum and have had no response.


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