cvs checkout with -r and -D option, is it a bug?

[Makoto Matsushita]

Why these two commands differ the result?

* works as expected

% sudo cvs -R -d /pub/snapshots/cvsup/FreeBSD.cvs checkout -P -D 'Tue Oct 26 00:00:00 JST 2004' -rRELENG_5 src/lib/compat/compat4x.i386/libhistory.so.4.bz2.uu
U src/lib/compat/compat4x.i386/libhistory.so.4.bz2.uu

* doesn't work

% sudo cvs -R -d /pub/snapshots/cvsup/FreeBSD cvs checkout -P -D 'Tue Oct 26 00:00:00 JST 2004' -rRELENG_5 src/lib/compat/compat4x.i386/libc.so.4.bz2.uu
cvs checkout: warning: new-born src/lib/compat/compat4x.i386/libc.so.4.bz2.uu has disappeared

Note that I cannot checkout libc.so.4.bz2.uu, libc_r.so.4.bz2.uu, and
libperl.so.3.bz2.uu in src/lib/compat/compat4x.i386.

I'm using cvs(1) bundled with recent 5-stable and/or 6-current,
version 1.11.17-FreeBSD.

-- -
Makoto `MAR' Matsushita