[BUG] Filling in source blocks fills by region, not paragraph [9.5.5 (release_9.5.5/master)]

[Farblos]

Cloned https://git.savannah.gnu.org/git/emacs/org-mode.git, changed to 
directory "org-mode", made "autoloads", started Emacs as "emacs -Q -L $PWD".

In an otherwise empty org-mode buffer, create a block

#+begin_src shell
# configure shell options and variables.  bash-completion
# requires shell option extglob, anyway, so set and use it
# without further pondering about adverse consequences.
shopt -s checkwinsize
shopt -s direxpand
shopt -s extglob
#+end_src

Move point into the comment part of that shell snippet and press M-q.  The 
result should look like this:

#+begin_src shell
  # configure shell options and variables.  bash-completion requires
  # shell option extglob, anyway, so set and use it without further
  # pondering about adverse consequences.  shopt -s checkwinsize shopt
  # -s direxpand shopt -s extglob
#+end_src

That is, code and comment got filled into one big comment.

When changing into edit mode first, only the comment part gets filled, as it 
would happen also in a real sh-mode buffer.

The root cause should be this snippet from `org-fill-element':

           (org-babel-do-in-edit-buffer
            ;; `org-babel-do-in-edit-buffer' will preserve region if it
            ;; is within src block contents.  Otherwise, the region
            ;; crosses src block boundaries.  We re-fill the whole src
            ;; block in such scenario.
            (when (and regionp (not (region-active-p)))
              (push-mark (point-min))
              (goto-char (point-max))
              (setq mark-active t))
            (funcall-interactively #'fill-paragraph justify 'region))))

where `fill-paragraph' gets called with an active region.

To me that seems strange, at least for source blocks.  If this is really 
intended, it should probably be made configurable.

Thanks

Jens

Emacs  : GNU Emacs 28.2 (build 2, x86_64-pc-linux-gnu, X toolkit, cairo version 
1.16.0, Xaw3d scroll bars)
 of 2023-03-14, modified by Debian
Package: Org mode version 9.5.5 (release_9.5.5 @ 
/usr/share/emacs/28.2/lisp/org/)

current state:
==============
(setq
 org-link-elisp-confirm-function 'yes-or-no-p
 org-bibtex-headline-format-function #[257 "\300
\236A\207" [:title] 3 "\n\n(fn 
ENTRY)"]
 org-export-before-parsing-hook '(org-attach-expand-links)
 org-archive-hook '(org-attach-archive-delete-maybe)
 org-cycle-hook '(org-cycle-hide-archived-subtrees org-cycle-hide-drawers
                  org-cycle-show-empty-lines
                  org-optimize-window-after-visibility-change)
 org-mode-hook '(#[0 "\300\301\302\303\304$\207"
                   [add-hook change-major-mode-hook org-show-all append local]
                   5]
                 #[0 "\300\301\302\303\304$\207"
                   [add-hook change-major-mode-hook org-babel-show-result-all
                    append local]
                   5]
                 org-babel-result-hide-spec org-babel-hide-all-hashes)
 org-confirm-shell-link-function 'yes-or-no-p
 outline-isearch-open-invisible-function 'outline-isearch-open-invisible
 org-agenda-before-write-hook '(org-agenda-add-entry-text)
 org-src-mode-hook '(org-src-babel-configure-edit-buffer
                     org-src-mode-configure-edit-buffer)
 org-confirm-elisp-link-function 'yes-or-no-p
 org-speed-command-hook '(org-speed-command-activate
                          org-babel-speed-command-activate)
 org-tab-first-hook '(org-babel-hide-result-toggle-maybe
                      org-babel-header-arg-expand)
 org-link-shell-confirm-function 'yes-or-no-p
 org-babel-pre-tangle-hook '(save-buffer)
 org-agenda-loop-over-headlines-in-active-region nil
 org-occur-hook '(org-first-headline-recenter)
 org-metadown-hook '(org-babel-pop-to-session-maybe)
 org-link-parameters '(("attachment" :follow org-attach-follow :complete
                        org-attach-complete-link)
                       ("id" :follow org-id-open)
                       ("eww" :follow org-eww-open :store org-eww-store-link)
                       ("rmail" :follow org-rmail-open :store
                        org-rmail-store-link)
                       ("mhe" :follow org-mhe-open :store org-mhe-store-link)
                       ("irc" :follow org-irc-visit :store org-irc-store-link
                        :export org-irc-export)
                       ("info" :follow org-info-open :export org-info-export
                        :store org-info-store-link)
                       ("gnus" :follow org-gnus-open :store
                        org-gnus-store-link)
                       ("docview" :follow org-docview-open :export
                        org-docview-export :store org-docview-store-link)
                       ("bibtex" :follow org-bibtex-open :store
                        org-bibtex-store-link)
                       ("bbdb" :follow org-bbdb-open :export org-bbdb-export
                        :complete org-bbdb-complete-link :store
                        org-bbdb-store-link)
                       ("w3m" :store org-w3m-store-link)
                       ("doi" :follow org-link-doi-open :export
                        org-link-doi-export)
                       ("file+sys") ("file+emacs")
                       ("shell" :follow org-link--open-shell)
                       ("news" :follow
                        #[514 "\301\300\302Q\"\207"
                          ["news" browse-url ":"] 6 "\n\n(fn URL ARG)"]
                        )
                       ("mailto" :follow
                        #[514 "\301\300\302Q\"\207"
                          ["mailto" browse-url ":"] 6 "\n\n(fn URL ARG)"]
                        )
                       ("https" :follow
                        #[514 "\301\300\302Q\"\207"
                          ["https" browse-url ":"] 6 "\n\n(fn URL ARG)"]
                        )
                       ("http" :follow
                        #[514 "\301\300\302Q\"\207"
                          ["http" browse-url ":"] 6 "\n\n(fn URL ARG)"]
                        )
                       ("ftp" :follow
                        #[514 "\301\300\302Q\"\207" ["ftp" browse-url ":"]
                          6 "\n\n(fn URL ARG)"]
                        )
                       ("help" :follow org-link--open-help :store
                        org-link--store-help)
                       ("file" :complete org-link-complete-file)
                       ("elisp" :follow org-link--open-elisp))
 org-metaup-hook '(org-babel-load-in-session-maybe)
 )