Missing files in Bison's texinfo tarball?

It seems that there are missing files in the texinfo tarball file of
GNU Bison.

After downloading and extracting
<https://www.gnu.org/software/bison/manual/bison.texi.tar.gz>, I run
the following command and get these errors:

$ texi2any --epub3 bison.texi
bison.texi:11548: warning: @anchor should not appear in @itemx
bison.texi:11871: warning: @anchor should not appear in @itemx
bison.texi:10854: warning: @image file `figs/example' (for HTML) not found,=
 using `figs/example.svg'
.texi2any-real: @image file `figs/example' can not be copied
bison.texi:10892: warning: @image file `figs/example-shift' (for HTML) not =
found, using `figs/example-shift.svg'
.texi2any-real: @image file `figs/example-shift' can not be copied
bison.texi:10914: warning: @image file `figs/example-reduce' (for HTML) not=
 found, using `figs/example-reduce.svg'
.texi2any-real: @image file `figs/example-reduce' can not be copied

The texi2any version (just for completeness):

$ texi2any --version
texi2any (GNU texinfo) 7.0.3

Copyright (C) 2023 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.htm=
l>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Many thanks,
Yuval Langer.