[syslog-ng] MSGHDR and rewriting PROGRAM macro

I've got a box running syslog-ng 3.2.4, and I have a rewrite changing the PROGRAM macro. The problem is this doesnt affect the contents of the MSGHDR macro. Additionally if you try to do a rewrite on MSGHDR, it complains that MSGHDR is read-only. I'm inclined to say this is a bug, but wanted to get official opinion on the issue. -Patrick