I've debugged this issue a little, and it's not actually a copy bug.
But a libdbusmenu issue, that might happen also with other indicators (see bug #1086563)
If you're brave enough you might want to try the fix by compiling by yourself my libdbusmenu (using the --with-gtk=2 configure flag, if you need it only for copy)
Quick instructions, that will fix your CopyAgent:
Code:
bzr branch lp:~3v1n0/libdbusmenu/really-recreate-menu libdbusmenu
cd libdbusmenu
sudo apt-get build-dep libdbusmenu-gtk4
./autogen.sh --with-gtk=2
make install DESTDIR=$PWD/install
sudo cp install/usr/local/lib/libdbusmenu-gtk.so.* $SAME_DIRECTORY_WHERE_YOUR_CopyAgent_IS