C-x n n C-x n w weirdness in Info

[Ralph Möritz]

Typing the following command sequence

C-h i
m Emacs
m Bugs
C-<SPC>
M-20 C-n
C-x n n
C-x n w

causes the Prev, Next and Up links in the Info header to vanish!
The commands `u', `p', 'n' respond with the message "Node has no
[Up|Previous|Next]". I have also observed this behaviour in a 
recent CVS Emacs 22.0.50.1 on GNU/Linux.


In GNU Emacs 22.0.50.1 (i386-mingw-nt5.1.2600)
 of 2006-04-22 on YAMALOK
X server distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (4.1) --cflags  -O2 -march=i686
-mtune=i686 -lm -ffast-math -IC:/gnuwin32/include_emacs -IC:/gnuwin32/lib
-IC:/gnuwin32/src --ldflags  -s '

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: ENS
  locale-coding-system: cp1252
  default-enable-multibyte-characters: t

Major mode: Info

Minor modes in effect:
  show-paren-mode: t
  encoded-kbd-mode: t
  tooltip-mode: t
  auto-compression-mode: t
  tool-bar-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  unify-8859-on-encoding-mode: t
  utf-translate-cjk-mode: t
  line-number-mode: t

Recent input:
C-h i m E m a c s <return> C-SPC C-u 1 5 C-n C-x n 
n C-x n w <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<menu-bar> <help-menu> <report-emacs-bug>

Recent messages:
Loading paren...done
For information about the GNU Project and its goals, type C-h C-p.
Loading info...
Loading easymenu...done
Loading info...done
Composing main Info directory...done
Mark set
Loading emacsbug...
Loading regexp-opt...done
Loading emacsbug...done