mksession - :source session.vim not restore help files

I :mksession ~/.vim/sessions/project_1.vim - and this 'project'
has at least one :help open. When I
:source project_1.vim the help buffers are not there. They don't
even show up in :buffers! (or :ls!)

If I do vim ~/.vim/sessions/project_1.vim and THEN I do
:source % it works just fine.

Doing vim -S my_session_file.vim doesn't work either.

Silex, on #vim pointed me to this code in my 'project_1.vim' file:

if exists('s:wipebuf')
silent exe 'bwipe ' . s:wipebuf
endif
unlet! s:wipebuf

:mksession is somehow adding those lines in my session.vim files.

If I comment or delete those lines, then I am able to :source my
session files, and the :help files show up fine.

echo &sessionoptions shows:
blank,buffers,curdir,folds,help,options,tabpages,winsize

Any help would be appreciated. Thanks in advance.

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