Recursive publish bug?

[Felix E. Klee]

I’m using version 9.4.6.  See below what happens when I `org-publish`
to a remote server.  The subdirectory structure is not properly
mapped.  Is this a bug?

On my system:

    project
      .dir-locals.el
      index.org
      images
        a.jpg
      subdir
        index.org
        images
          b.jpg

Result on the server:

    project
      index.html
      images
        a.jpg
        b.jpg
      subdir
        index.html

Contents of `.dir-locals` (manually anonymized):

    ((org-mode
      . ((org-publish-project-alist
          . (("pages"
              :html-doctype "html5"
              :html-html5-fancy t
              :html-head-include-scripts nil
              :html-head-include-default-style nil
              :base-directory "/my/local/computer/project"
              :base-extension "org"
              :recursive t
              :publishing-directory
              "/plink:user@my-server.example.com:/remote/project/"
              :publishing-function org-html-publish-to-html)
             ("static"
              :base-directory "."
              :base-extension "css\\|txt\\|jpg\\|gif\\|png"
              :recursive t
              :publishing-directory
              "/plink:user@my-server.example.com:/remote/project/"
              :exclude "/hires"
              :publishing-function org-publish-attachment)
             ("all" :components ("pages" "static")))))))