bug#47338: 28.0.50; Unexpected error in fill-region

Evaluating next sexp results in error:
(with-temp-buffer
(let ((fill-column 66))
(insert " :action (lambda (docid msg target)")
(fill-region (point-min) (point-max) 'left t)
(buffer-string)))

Here is the backtrace:
Debugger entered--Lisp error: (error "Invalid search bound (wrong side of point)")
re-search-backward("[ \11]\\|\\c|.\\|.\\c|" 71 0)
fill-move-to-break-point(71)
fill-region-as-paragraph(1 70 left t)
fill-region(1 70 left t)
(let ((fill-column 66)) (insert " :action (lambda...") (fill-region (point-min) (point-max) 'left t) (buffer-string))
...

This was very unexpected. I believe Emacs26 does not have such behaviour.

Is there anything I can do to fix this ASAP ? This bug is very annoying

-----
In GNU Emacs 28.0.50 (build 11, x86_64-pc-linux-gnu, GTK+ Version 3.24.20, cairo version 1.16.0)
of 2021-03-12 built on x1
Repository revision: b08b2e03b255c0ad85bd026a8d786b21ee22eee8
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12008000
System Description: Ubuntu 20.04.1 LTS

Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON
LIBSELINUX LIBXML2 MODULES NOTIFY
INOTIFY PDUMPER PNG RSVG SOUND
THREADS TIFF TOOLKIT_SCROLL_BARS X11
XDBE XIM XPM GTK3 ZLIB

Important settings:
value of $LC_MONETARY: ru_RU.UTF-8
value of $LC_NUMERIC: ru_RU.UTF-8
value of $LC_TIME: ru_RU.UTF-8
value of $LANG: en_US.UTF-8
value of $XMODIFIERS: @im=ibus
locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
magit-auto-revert-mode: t
global-git-commit-mode: t
tracking-mode: t
global-telega-mnz-mode: t
telega-mnz-mode: t
global-telega-url-shorten-mode: t
telega-stories-mode: t
global-telega-live-location-mode: t
telega-patrons-mode: t
global-telega-squash-message-mode: t
telega-autoplay-mode: t
telega-appindicator-mode: t
telega-mode-line-mode: t
helm-ff-cache-mode: t
async-bytecomp-package-mode: t
desktop-save-mode: t
save-place-mode: t
company-mode: t
pyvenv-mode: t
which-function-mode: t
shell-dirtrack-mode: t
global-paren-face-mode: t
paren-face-mode: t
dot-mode: t
display-time-mode: t
global-undo-tree-mode: t
undo-tree-mode: t
icomplete-mode: t
disable-mouse-global-mode: t
override-global-mode: t
global-eldoc-mode: t
eldoc-mode: t
mouse-wheel-mode: t
file-name-shadow-mode: t
global-font-lock-mode: t
auto-composition-mode: t
auto-encryption-mode: t
auto-compression-mode: t
column-number-mode: t
line-number-mode: t
transient-mark-mode: t

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Features:
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vc-hg vc-bzr vc-src vc-sccs vc-svn
vc-cvs vc-rcs bug-reference
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magit-commit magit-sequence
magit-notes magit-worktree magit-tag
magit-merge magit-branch magit-reset
magit-files magit-refs magit-status
magit magit-repos magit-apply
magit-wip magit-log magit-diff
smerge-mode magit-core
magit-autorevert magit-margin
magit-transient magit-process
magit-mode git-commit transient
magit-git magit-section magit-utils
crm log-edit pcvs-util with-editor
dash dired-aux apropos slime arc-mode
archive-mode hyperspec cc-awk
cl-print skeleton dabbrev vterm
face-remap term disp-table ehelp
vterm-module language-detection
misearch multi-isearch mule-util
hl-line tracking shorten
telega-obsolete telega-mnz ol-telega
telega-url-shorten telega-stories
telega-dashboard telega-live-location
geo-simulate geo telega
telega-tdlib-events telega-webpage
visual-fill-column telega-root
telega-info telega-chat telega-modes
telega-company telega-user
telega-notifications notifications
telega-voip telega-msg telega-tme
telega-sticker telega-i18n
telega-vvnote bindat telega-ffplay
telega-media telega-sort
telega-filter telega-ins
telega-folders telega-inline
telega-tdlib telega-util
rainbow-identifiers telega-server
telega-core cursor-sensor
telega-customize emacsbug sendmail
add-log macrostep-c cmacexp macrostep
cc-mode cc-fonts cc-guess cc-menus
cc-styles cc-align company-oddmuse
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company-dabbrev company-files
company-clang company-cmake
company-semantic company-template
company-bbdb helm-files helm-buffers
helm-occur helm-tags helm-locate
helm-grep helm-regexp helm-utils
helm-help helm-types helm
async-bytecomp helm-global-bindings
helm-easymenu helm-source
helm-multi-match helm-lib async
vc-git org-eldoc org-element avl-tree
ol-eww eww xdg url-queue mm-url
ol-rmail ol-mhe ol-irc ol-info
ol-gnus nnselect gnus-search
eieio-opt speedbar ezimage dframe
gnus-art mm-uu mml2015 mm-view
mml-smime smime dig gnus-sum shr
kinsoku svg dom ol-docview doc-view
jka-compr image-mode exif ol-bibtex
bibtex ol-bbdb ol-w3m org ob
ob-tangle ob-ref ob-lob ob-table
ob-exp org-macro org-footnote org-src
ob-comint org-pcomplete org-list
org-faces org-entities noutline
outline org-version ob-emacs-lisp
ob-core ob-eval org-table ol org-keys
org-compat org-macs org-loaddefs
dockerfile-mode sh-script smie
executable dashboard
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all-the-icons-faces data-material
data-weathericons data-octicons
data-fileicons data-faicons
data-alltheicons memoize recentf
tree-widget home lichess
lichess-runtime lichess-api
lichess-util sound-wav deferred
request autorevert filenotify cider
cider-debug cider-browse-ns
cider-mode cider-inspector
cider-completion cider-profile
cider-eval cider-repl-history pulse
cider-repl cider-resolve cider-test
cider-overlays cider-stacktrace
cider-doc cider-browse-spec
cider-clojuredocs cider-eldoc
cider-client cider-common
cider-connection cider-util
cider-popup sesman-browser
nrepl-client queue nrepl-dict
cider-compat spinner sesman vc
vc-dispatcher clojure-mode lisp-mnt
align parseedn parseclj-parser
parseclj-lex a desktop frameset
gnus-demon nntp gnus-group gnus-undo
gnus-start gnus-dbus dbus xml
gnus-cloud nnimap nnmail mail-source
utf7 netrc gnus-spec gnus-win nnoo
gnus-int gnus-range message rfc822
mml mml-sec epa derived epg
epg-config mm-decode mm-bodies
mm-encode mailabbrev gmm-utils
mailheader gnus nnheader gnus-util
rmail rmail-loaddefs mail-utils
autoinsert cal-menu calendar
cal-loaddefs saveplace cython-mode
company-capf company-posframe
posframe company pcase help-fns
radix-tree elpy elpy-rpc pyvenv
eshell esh-cmd esh-ext esh-opt
esh-proc esh-io esh-arg esh-module
esh-groups esh-util elpy-shell
elpy-profile elpy-django s
elpy-refactor diff-mode python grep
etags fileloop generator xref project
cus-edit cus-start cus-load wid-edit
python-mode info-look tramp-sh tramp
tramp-loaddefs trampver
tramp-integration files-x
tramp-compat parse-time iso8601
time-date ls-lisp format-spec
which-func imenu shell pcomplete
hippie-exp flymake-proc flymake
warnings thingatpt ert pp ewoc debug
backtrace find-func compile
text-property-search cc-cmds
cc-engine cc-vars cc-defs paren-face
dot-mode gist dired dired-loaddefs
gh-gist gh-oauth gh-api logito
gh-cache pcache cl gh-auth gh-common
marshal gh-url eieio-compat url-http
url-auth mail-parse rfc2231 rfc2047
rfc2045 mm-util ietf-drums mail-prsvr
url-gw nsm rmc puny gh-profile
timezone eieio-base server time
google-translate
google-translate-default-ui
google-translate-core-ui color popup
google-translate-core
google-translate-tk
google-translate-backend whitespace
undo-tree diff ido icomplete comint
ansi-color ring avoid disable-mouse
page-break-lines ibuffer-vc ibuf-ext
ibuffer ibuffer-loaddefs advice
browse-kill-ring delsel cl-extra
help-mode use-package
use-package-ensure
use-package-delight
use-package-diminish
use-package-bind-key bind-key
use-package-core finder-inf tex-site
rx easy-mmode slime-autoloads
w3m-load info edmacro kmacro package
browse-url url url-proxy url-privacy
url-expand url-methods url-history
url-cookie url-domsuf url-util
mailcap url-handlers url-parse
auth-source cl-seq eieio eieio-core
cl-macs eieio-loaddefs password-cache
json subr-x map url-vars seq byte-opt
gv bytecomp byte-compile cconv
cl-loaddefs cl-lib iso-transl tooltip
eldoc electric uniquify ediff-hook
vc-hooks lisp-float-type mwheel
term/x-win x-win term/common-win
x-dnd tool-bar dnd fontset image
regexp-opt fringe tabulated-list
replace newcomment text-mode
elisp-mode lisp-mode prog-mode
register page tab-bar menu-bar
rfn-eshadow isearch easymenu timer
select scroll-bar mouse jit-lock
font-lock syntax facemenu font-core
term/tty-colors frame minibuffer
cl-generic cham georgian utf-8-lang
misc-lang vietnamese tibetan thai
tai-viet lao korean japanese eucjp-ms
cp51932 hebrew greek romanian slovak
czech european ethiopic indian
cyrillic chinese composite charscript
charprop case-table epa-hook
jka-cmpr-hook help simple abbrev
obarray cl-preloaded nadvice button
loaddefs faces cus-face macroexp
files window text-properties overlay
sha1 md5 base64 format env code-pages
mule custom widget
hashtable-print-readable backquote
threads dbusbind inotify
dynamic-setting system-font-setting
font-render-setting cairo
move-toolbar gtk x-toolkit x
multi-tty make-network-process emacs)

Memory information:
((conses 16 5916195 1313993)
(symbols 48 67868 2)
(strings 32 588910 80411)
(string-bytes 1 18321977)
(vectors 16 323311)
(vector-slots 8 3137917 585741)
(floats 8 223337 3255)
(intervals 56 670405 25895)
(buffers 992 137))

--
lg

From:	Evgeny Zajcev
Subject:	bug#47338: 28.0.50; Unexpected error in fill-region
Date:	Tue, 23 Mar 2021 12:43:20 +0300