At some point in the last few months, org mode stopped fontifying my
latex export blocks. However, an older version of emacs on my computer
still does fontify.
(The difference is seen even opening emacs with the -q flag)
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
 )