A redisplay bug in 22.0.99?

[Juanma Barranquero]

With 22.0.99 on Windows:

emacs -Q

C-x d etc/images/ <RET>
C-n C-o       => display README
C-5 C-n C-o   => display cancel.pbm

cancel.pbm is shown as an empty box in the lower window, which is not
correctly redrawn (it has leftover pixels from the previous contents).

Does anyone else see this?

            Juanma