Apache Custom Log and Cookies

In a web application, I send two cookies to the user. I want to
include one of them in the log file. So in the LogFormat directive,
I include '%{cookie_name}C'. The cookie does not get logged.

If I remove the other cookie so the browser is only sending the one,
it gets logged just fine. So the problem seems to have something to
do with multiple cookies.

Am I doing something wrong, or is this a bug in Apache. (Version is
2.2.3 running on SuSE Linux Enterprise Server 10.1.)

Thanks!
john