At some point in the last few months, org mode stopped fontifying my
It seems that there was a change to the function
org-fontify-meta-lines-and-blocks-1 in org.el, specifically at the
conditional that checks org-src-fontify-natively.
As the comment there explains, the intention is to only fontify src
blocks, but I don't see any option exposed to enable fontififcation of
export blocks, which is a fairly crucial feature to my workflow.

I think fontification of export blocks should follow that of src blocks,
or a separate option should be made. (Or, I may be missing some already
existing solution!)

For what it is worth, I can get the desired behavior by modifying the
code mentioned above to include "export", as in the following:
(and org-src-fontify-natively
    ;; Technically, according to
    ;; `org-src-fontify-natively' docstring, we should
    ;; only fontify src blocks.  However, it is common
    ;; to use undocumented fontification of example
    ;; blocks with undocumented language specifier.
    ;; Keep this undocumented feature for user
    ;; convenience.
    (member block-type '("src" "example" "export")))

Thanks,
Ben


Emacs  : GNU Emacs 31.0.50 (build 3, aarch64-apple-darwin23.5.0, NS appkit-2487.60 Version 14.5 (Build 23F79))
 of 2024-08-29
Package: Org mode version 9.7.10 (release_9.7.10 @ /Users/ben/Scripts/emacs/lisp/org/)

current state:
==============
(setq
 org-noter-get-selected-text-hook '(org-noter-djvu--get-selected-text org-noter-nov--get-selected-text
   org-noter-pdf--get-selected-text)
 org-yank-image-file-name-function 'org-yank-image-autogen-filename
 org-persist-before-write-hook '(org-element--cache-persist-before-write)
 org-noter-doc-split-fraction '(0.6 . 0.5)
 org-html-format-headline-function 'org-html-format-headline-default-function
 org-html-format-drawer-function #[514 "\207" [] 3 "\n\n(fn NAME CONTENTS)"]
 org-noter--get-current-view-hook '(org-noter-djvu--get-current-view org-noter-nov--get-current-view
   org-noter-pdf--get-current-view)
 org-log-into-drawer "LOG"
 org-latex-format-inlinetask-function 'org-latex-format-inlinetask-default-function
 org-M-RET-may-split-line nil
 org-noter--pretty-print-location-for-title-hook '(org-noter-djvu--pretty-print-location
  org-noter-nov--pretty-print-location
  org-noter-pdf--pretty-print-location-for-title)
 org-babel-tangle-lang-exts '(("python" . "py") ("emacs-lisp" . "el") ("elisp" . "el"))
 org-treat-insert-todo-heading-as-state-change t
 org-noter--get-highlight-location-hook '(org-noter-pdf--get-highlight)
 org-roam-db-node-include-function #[0 "\300\207" [t] 1]
 org-timer-done-hook '(my/org-timer-done-actions)
 org-roam-log-setup-hook '(org-roam--register-completion-functions-h)
 org-speed-command-hook '(org-speed-command-activate org-babel-speed-command-activate)
 org-export-in-background t
 org-persist-after-read-hook '(org-element--cache-persist-after-read)
 org-confirm-elisp-link-function 'yes-or-no-p
 org-roam-preview-function 'org-roam-preview-default-function
 org-latex-format-headline-function 'org-latex-format-headline-default-function
 org-agenda-window-setup 'current-window
 org-noter--convert-to-location-cons-hook '(org-noter-pdf--convert-to-location-cons)
 org-latex-format-drawer-function #[514 "\207" [] 3 "\n\n(fn _ CONTENTS)"]
 org-blank-before-new-entry '((heading) (plain-list-item))
 org-export-async-init-file "~/.emacs.d/org/export-dispatch-init.el"
 org-mode-hook '(my/org-mode-completion-setup #[nil ((org-bullets-mode 1)) (t)] er/add-org-mode-expansions
#[nil ((add-hook 'change-major-mode-hook 'org-fold-show-all 'append 'local))
  (org--rds reftex-docstruct-symbol org-attach-method org--single-lines-list-is-paragraph
   org-element-greater-elements org-agenda-restrict-end org-agenda-restrict-begin
   org-agenda-restrict visual-fill-column-width org-clock-history org-agenda-current-date
   org-with-time org-defdecode org-def org-read-date-inactive org-ans2 org-ans1
   org-columns-current-fmt-compiled org-clock-current-task org-clock-effort
   org-agenda-skip-function org-agenda-skip-comment-trees org-agenda-archives-mode
   org-end-time-was-given org-time-was-given org-log-note-extra org-log-note-purpose
   org-log-post-message org-last-inserted-timestamp org-last-changed-timestamp
   org-entry-property-inherited-from org-state org-agenda-headline-snapshot-before-repeat
   org-agenda-buffer-name org-agenda-start-on-weekday org-agenda-buffer-tmp-name
   org-log-note-marker org-priority-regexp org-mode-abbrev-table org-element-cache-persistent
   org-element-cache-version org-tbl-menu org-org-menu org-struct-menu org-entities
   org-last-state org-id-track-globally org-clock-start-time texmathp-why remember-data-file
   org-agenda-tags-todo-honor-ignore-options calc-embedded-open-mode calc-embedded-open-formula
   calc-embedded-close-formula align-mode-rules-list org-emphasis-alist
   org-emphasis-regexp-components org-export-registered-backends org-modules
   org-babel-load-languages org-id-overriding-file-name org-indent-indentation-per-level
   org-element--timestamp-regexp org-element-cache-map-continue-from
   org-element-paragraph-separate org-agenda-buffer-name org-inlinetask-min-level t)
  ]
#[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
#[0 "\301\211 \207" [imenu-create-index-function org-imenu-get-tree] 2])
 org-noter--doc-approx-location-hook '(org-noter-djvu--approx-location-cons org-noter-nov--approx-location-cons
      org-noter-pdf--approx-location-cons)
 org-noter--pretty-print-highlight-location-hook '(org-noter-pdf--pretty-print-highlight)
 org-noter-auto-save-last-location t
 org-noter-set-up-document-hook '(org-noter-djvu--setup-handler org-noter-nov--setup-handler
 org-noter-pdf--doc-view-setup-handler org-noter-pdf--pdf-view-setup-handler)
 org-capture-templates '(("i" "File to inbox" entry
 (file+olp "~/Projects/getitdone/getitdone.org" "PARA" "PROJECTS" "PROCESS") "* %?")
("e" "File to emacs issues" entry
 (file+olp "~/.emacs.d/emacs-gtd.org" "Emacs PARA" "PROJECTS" "PROCESS") "* %?")
("m" "Math note" entry
 (file+olp "~/Projects/getitdone/math-gtd.org" "MATH PARA" "PROJECTS" "PROCESS") "* %?")
("f" "File to filing cabinet" entry
 (file+olp "~/Projects/getitdone/getitdone.org" "PARA" "PROJECTS" "FILE") "* %?")
("l" "Local inbox" entry
 (file+headline
  (lambda nil (concat (file-name-directory (buffer-file-name)) ".TODO.org")) "Inbox")
 "")
("r" "Research note" entry
 (file+headline (lambda nil (concat (buffer-file-name))) "RESEARCH NOTES")
 "* %?\n:LOG:\nENTRY-DATE: %t\n:END:\n- " :prepend t :jump-to-captured t)
("t" "File to tumble ideas" entry
 (file+olp "~/Projects/getitdone/getitdone.org" "PARA" "AREAS" "tumbles") "* %?")
)
 org-id-link-consider-parent-id t
 org-confirm-shell-link-function 'yes-or-no-p
 org-export-dispatch-use-expert-ui t
 org-odt-format-headline-function 'org-odt-format-headline-default-function
 org-archive-hook '(org-attach-archive-delete-maybe)
 org-src-window-setup "plain"
 org-noter--show-arrow-hook '(org-noter-pdf--show-arrow)
 org-metaup-hook '(org-babel-load-in-session-maybe)
 org-occur-hook '(org-first-headline-recenter)
 org-ellipsis " \\/ "
 org-html-format-inlinetask-function 'org-html-format-inlinetask-default-function
 org-roam-node-annotation-function 'org-roam-node-read--annotation
 org-bullets-bullet-list '("○")
 org-confirm-babel-evaluate 'my/org-confirm-babel-evaluate
 org-ascii-format-drawer-function #[771 " \207" [] 4 "\n\n(fn NAME CONTENTS WIDTH)"]
 org-roam-directory "/Users/ben/own/org-roam"
 org-indent-indentation-per-level 1
 org-roam-db-autosync-mode t
 org-roam-indirect-buffer-hook '(org-roam--register-completion-functions-h)
 org-bibtex-headline-format-function 'org-bibtex-headline-format-default
 org-capture-prepare-finalize-hook '(org-roam-capture--install-finalize-h)
 org-link-parameters '(("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
:insert-description org-info-description-as-command)
      ("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)
      ("roam" :follow org-roam-link-follow-link)
      ("attachment" :follow org-attach-follow :complete org-attach-complete-link)
      ("id" :follow org-roam-id-open :store org-id-store-link-maybe) ("file+sys")
      ("file+emacs") ("shell" :follow org-link--open-shell)
      ("news" :follow
#[514 "\301\300\302 Q \"\207" ["news" browse-url ":"] 6 "\n\n(fn URL ARG)"])
      ("mailto" :follow
#[514 "\301\300\302 Q \"\207" ["mailto" browse-url ":"] 6 "\n\n(fn URL ARG)"])
      ("https" :follow
#[514 "\301\300\302 Q \"\207" ["https" browse-url ":"] 6 "\n\n(fn URL ARG)"])
      ("http" :follow
#[514 "\301\300\302 Q \"\207" ["http" browse-url ":"] 6 "\n\n(fn URL ARG)"])
      ("ftp" :follow
#[514 "\301\300\302 Q \"\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-log-buffer-setup-hook '(org-roam-log--setup)
 org-noter-create-skeleton-functions '(org-noter-djvu--create-skeleton org-noter-nov--create-skeleton-epub
      org-noter-pdf--create-skeleton)
 org-noter-get-buffer-file-name-hook '(org-noter-nov--get-buffer-file-name org-noter-pdf--get-buffer-file-name)
 org-cycle-tab-first-hook '(org-babel-hide-result-toggle-maybe org-babel-header-arg-expand)
 org-todo-keywords '((sequence "TODO(t!)" "|" "SUSP(s@)" "DONE(d!)"))
 org-return-follows-link t
 org-noter--get-containing-element-hook '(org-noter--get-containing-heading
 org-noter--get-containing-property-drawer)
 org-agenda-before-write-hook '(org-agenda-add-entry-text)
 org-metadown-hook '(org-babel-pop-to-session-maybe)
 org-agenda-restore-windows-after-quit t
 org-tab-first-hook '(org-babel-hide-result-toggle-maybe org-babel-header-arg-expand)
 org-sort-function 'string-collate-lessp
 org--warnings nil
 org-startup-folded t
 org-babel-pre-tangle-hook '(save-buffer)
 org-roam-capture-new-node-hook '(org-roam-capture--insert-captured-ref-h)
 org-highlight-latex-and-related '(latex script entities)
 org-noter--get-precise-info-hook '(org-noter-djvu--get-precise-info org-noter-nov--get-precise-info
   org-noter-pdf--doc-view-get-precise-info
   org-noter-pdf--pdf-view-get-precise-info)
 org-tags-column -90
 org-export-before-parsing-hook '(org-attach-expand-links)
 org-link-shell-confirm-function 'yes-or-no-p
 org-cycle-emulate-tab nil
 org-fold-core-isearch-open-function 'org-fold--isearch-reveal
 org-yank-adjusted-subtrees t
 org-roam-capture-preface-hook '(org-roam-capture--try-capture-to-ref-h)
 outline-isearch-open-invisible-function 'outline-isearch-open-invisible
 org-noter--doc-goto-location-hook '(org-noter-djvu--goto-location org-noter-nov--goto-location
    org-noter-pdf--goto-location)
 org-src-mode-hook '(perject--auto-add-buffer org-src-babel-configure-edit-buffer
    org-src-mode-configure-edit-buffer)
 org-roam-find-file-hook '(org-roam-buffer--setup-redisplay-h org-roam--register-completion-functions-h
  org-roam--replace-roam-links-on-save-h org-roam-db-autosync--setup-update-on-save-h)
 org-babel-load-languages '((emacs-lisp . t) (python . t) (gnuplot \.t))
 org-roam-ref-annotation-function 'org-roam-ref-read--annotation
 org-agenda-loop-over-headlines-in-active-region nil
 org-agenda-files '("~/Areas/reading/.TODO.org" "~/Areas/reading/read_log.org" "~/Areas/talks/Stacks/.TODO.org"
   "~/.emacs.d/.TODO.org" "~/.emacs.d/emacs-gtd.org" "~/.emacs.d/emacs-gtd.org_archive"
   "~/Projects/235embeddingsPaper/sagecalcs/.TODO.org"
   "~/Projects/235embeddingsPaper/.TODO.org" "~/Projects/235embeddingsPaper/.TODO.org_archive"
   "~/Projects/235embeddingsPaper/embeddings.org" "~/Projects/235embeddingsPaper/paper.org"
   "~/Projects/HessianMetrics/sagecalcs/.TODO.org" "~/Projects/HessianMetrics/.TODO.org"
   "~/Projects/HessianMetrics/hessianmetrics.org" "~/Projects/distributionmaps/.TODO.org"
   "~/Projects/distributionmaps/distributionmaps.org" "~/Projects/foliations/Ben/.TODO.org"
   "~/Projects/foliations/Ben/singularfolia.org" "~/Projects/getitdone/.TODO.org"
   "~/Projects/getitdone/KoreanTaxes.org" "~/Projects/getitdone/filingcabinet.org"
   "~/Projects/getitdone/getitdone.org" "~/Projects/getitdone/getitdone.org_archive"
   "~/Projects/getitdone/math-gtd.org" "~/Projects/glenelg/.TODO.org"
   "~/Projects/glenelg/glenelg.org" "~/Projects/lecturenotes/.TODO.org"
   "~/Projects/lecturenotes/notes.org" "~/Projects/miscmath/unfullblown.org"
   "~/Projects/pdemoduli/.TODO.org" "~/Projects/pdemoduli/pdemoduli.org"
   "~/Projects/singularities/.TODO.org")
 org-babel-python-command "python3"
 org-noter-create-session-from-document-hook '(org-noter--create-session-from-document-file-default)
 org-link-elisp-confirm-function 'yes-or-no-p
 org-noter--add-highlight-hook '(org-noter-pdf--highlight-location)
 org-startup-indented t
 org-odt-format-inlinetask-function 'org-odt-format-inlinetask-default-function
 org-src-lang-modes '(("latex" . LaTeX) ("C" . c) ("C++" . c++) ("asymptote" . asy) ("beamer" . latex)
     ("calc" . fundamental) ("cpp" . c++) ("ditaa" . artist) ("desktop" . conf-desktop)
     ("dot" . fundamental) ("elisp" . emacs-lisp) ("ocaml" . tuareg) ("screen" . shell-script)
     ("sqlite" . sql) ("toml" . conf-toml) ("shell" . sh) ("ash" . sh) ("sh" . sh)
     ("bash" . sh) ("jsh" . sh) ("bash2" . sh) ("dash" . sh) ("dtksh" . sh) ("ksh" . sh)
     ("es" . sh) ("rc" . sh) ("itcsh" . sh) ("tcsh" . sh) ("jcsh" . sh) ("csh" . sh)
     ("ksh88" . sh) ("oash" . sh) ("pdksh" . sh) ("mksh" . sh) ("posix" . sh) ("wksh" . sh)
     ("wsh" . sh) ("zsh" . sh) ("rpm" . sh))
 org-cycle-hook '(org-cycle-hide-archived-subtrees org-cycle-show-empty-lines
 org-cycle-optimize-window-after-visibility-change org-cycle-display-inline-images)
 org-persist-before-read-hook '(org-element--cache-persist-before-read)
 org-noter--pretty-print-location-hook '(org-noter-djvu--pretty-print-location
org-noter-nov--pretty-print-location
org-noter-pdf--pretty-print-location)
 org-ascii-format-inlinetask-function 'org-ascii-format-inlinetask-default
 org-odt-format-drawer-function #[514 "\207" [] 3 "\n\n(fn NAME CONTENTS)"]
 org-id-link-to-org-use-id 'create-if-interactive
 org-agenda-skip-archived-trees nil
 )