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A raíz de cambiar la forma de publicar en el blog observó que la exportación desde el modo org a html producía que htmlize insertara símbolos extraños al final de cada línea.

La solución la encontró en reddit, al parecer es un problema producido por el paquete fci, basta con instalar htmlize con la siguiente configuración

(use-package htmlize
  :defer t
  :config
  (prognq

    ;; It is required to disable `fci-mode' when `htmlize-buffer' is called;
    ;; otherwise the invisible fci characters show up as funky looking
    ;; visible characters in the source code blocks in the html file.
    ;; http://lists.gnu.org/archive/html/emacs-orgmode/2014-09/msg00777.html
    (with-eval-after-load 'fill-column-indicator
      (defvar modi/htmlize-initial-fci-state nil
        "Variable to store the state of `fci-mode' when `htmlize-buffer' is called.")

      (defun modi/htmlize-before-hook-fci-disable ()
        (setq modi/htmlize-initial-fci-state fci-mode)
        (when fci-mode
          (fci-mode -1)))

      (defun modi/htmlize-after-hook-fci-enable-maybe ()
        (when modi/htmlize-initial-fci-state
          (fci-mode 1)))

      (add-hook 'htmlize-before-hook #'modi/htmlize-before-hook-fci-disable)
      (add-hook 'htmlize-after-hook #'modi/htmlize-after-hook-fci-enable-maybe))

    ;; `flyspell-mode' also has to be disabled because depending on the
    ;; theme, the squiggly underlines can either show up in the html file
    ;; or cause elisp errors like:
    ;; (wrong-type-argument number-or-marker-p (nil . 100))
    (with-eval-after-load 'flyspell
      (defvar modi/htmlize-initial-flyspell-state nil
        "Variable to store the state of `flyspell-mode' when `htmlize-buffer' is called.")

      (defun modi/htmlize-before-hook-flyspell-disable ()
        (setq modi/htmlize-initial-flyspell-state flyspell-mode)
        (when flyspell-mode
          (flyspell-mode -1)))

      (defun modi/htmlize-after-hook-flyspell-enable-maybe ()
        (when modi/htmlize-initial-flyspell-state
          (flyspell-mode 1)))

      (add-hook 'htmlize-before-hook #'modi/htmlize-before-hook-flyspell-disable)
      (add-hook 'htmlize-after-hook #'modi/htmlize-after-hook-flyspell-enable-maybe))))

Tras la nueva instalación, los códigos desaparecen

Espero que te haya gustado, pasa un buen día. 🐧