bug#81584: 30.2; zero-width minibuffer

I got a broken minibuffer
after deleting all but one frame.

The echo area is blank except
for left, right or both arrows
at the bottom left corner of the screen,
evidently indicating line truncation.

(window-total-width (minibuffer-window)) => 2
(window-full-width-p (minibuffer-window)) => nil
(window-max-chars-per-line (minibuffer-window)) => 0

New frames work normally.

		Peace
			--Devon

P.S.  Dragging the mode line upwards produced
odd effects which may or may not be related
but for the record, here is a screen shot.

P.P.S.  This is the Emacs at 
https://EmacsForMacOSX.com/download/emacs-builds/Emacs-30.2-1-universal.dmg
MD5                             	SHA256
9020a7f4bf5cc6389092ddbbe2f03dc1	72b31176903a68a7b82093a94fedd51eda7ecbb3c54eae21a9160cedc88fab1f

In GNU Emacs 30.2 (build 1, x86_64-apple-darwin18.7.0, NS appkit-1671.60
  Version 10.14.6 (Build 18G9323)) of 2025-12-05 built on
  builder10-14.lan
Repository revision: 99746b19ec3d7cee2016aadfc85a2c093f90a434
Repository branch: HEAD
Windowing system distributor 'Apple', version 10.3.1671
System Description:  Mac OS X 10.14.6

Configured using:
  'configure --with-ns '--enable-locallisppath=/Library/Application
  Support/Emacs/${version}/site-lisp:/Library/Application
  Support/Emacs/site-lisp' --with-modules 'CFLAGS=-DFD_SETSIZE=10000
  -DDARWIN_UNLIMITED_SELECT' --with-x-toolkit=no'

Configured features:
ACL GLIB GMP GNUTLS JPEG LIBXML2 MODULES NOTIFY KQUEUE NS PDUMPER PNG
RSVG SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS TREE_SITTER WEBP XIM ZLIB

Important settings:
   value of $LANG: en_US.UTF-8
   locale-coding-system: utf-8-unix

Major mode: ERC

Minor modes in effect:
   erc-track-mode: t
   erc-track-minor-mode: t
   erc-ring-mode: t
   erc-netsplit-mode: t
   erc-menu-mode: t
   erc-match-mode: t
   erc-list-mode: t
   erc-irccontrols-mode: t
   erc-move-to-prompt-mode: t
   erc-readonly-mode: t
   erc-imenu-mode: t
   erc-pcomplete-mode: t
   erc-button-mode: t
   erc-fill-mode: t
   erc-stamp--date-mode: t
   erc-stamp-mode: t
   erc-autojoin-mode: t
   erc-networks-mode: t
   tooltip-mode: t
   global-eldoc-mode: t
   show-paren-mode: t
   electric-indent-mode: t
   mouse-wheel-mode: t
   tool-bar-mode: t
   menu-bar-mode: t
   file-name-shadow-mode: t
   global-font-lock-mode: t
   font-lock-mode: t
   blink-cursor-mode: t
   minibuffer-regexp-mode: t
   line-number-mode: t
   indent-tabs-mode: t
   transient-mark-mode: t
   auto-composition-mode: t
   auto-encryption-mode: t
   auto-compression-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message yank-media dired dired-loaddefs
rfc822 mml mml-sec epa derived epg rfc6068 epg-config gnus-util
mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils
mailheader sendmail rfc2047 rfc2045 ietf-drums mm-util mail-prsvr
mail-utils cl-extra shortdoc text-property-search comp-common rx
thingatpt gnutls network-stream puny nsm erc-track erc-ring erc-netsplit
erc-menu erc-match erc-list erc-goodies erc-imenu imenu erc-pcomplete
pcomplete comint ansi-osc ansi-color ring erc-button browse-url url
url-proxy url-privacy url-expand url-methods url-history url-cookie
generate-lisp-file url-domsuf url-util mailcap erc-fill erc-stamp
wid-edit erc-join url-parse url-vars erc auth-source cl-seq eieio
eieio-core cl-macs icons password-cache json map format-spec erc-backend
erc-networks erc-common erc-compat compat erc-loaddefs misearch
multi-isearch help-fns radix-tree cl-print byte-opt gv bytecomp
byte-compile debug backtrace help-mode find-func jka-compr info
time-date subr-x cl-loaddefs cl-lib rmc iso-transl tooltip cconv eldoc
paren electric uniquify ediff-hook vc-hooks lisp-float-type elisp-mode
mwheel term/ns-win ns-win ucs-normalize mule-util term/common-win
tool-bar dnd fontset image regexp-opt fringe tabulated-list replace
newcomment text-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 font-core term/tty-colors frame minibuffer nadvice seq
simple cl-generic indonesian philippine 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 emoji-zwj charscript charprop case-table
epa-hook jka-cmpr-hook help abbrev obarray oclosure cl-preloaded button
loaddefs theme-loaddefs faces cus-face macroexp files window
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget keymap hashtable-print-readable backquote threads kqueue
cocoa ns multi-tty make-network-process emacs)

Memory information:
((conses 16 147325 10122) (symbols 48 12710 0) (strings 32 43580 1649)
  (string-bytes 1 971235) (vectors 16 23741)
  (vector-slots 8 233043 12063) (floats 8 124 204)
  (intervals 56 1990 387) (buffers 992 18))