This is not really a bug. The missing icons are not default theme icons. If you really need all the icons that came with applications in the sailfish theme, you may need to copy those to the sailfish theme icons folder from the blanco theme icon folder.

Though I do not recommend it, if you really want all the icons to show the blanco theme icons in sailfish, you can link the icons folder under sailfish to the icons folder under blanco.

I HAVE NO IDEA WHAT THIS WILL DO IF YOU UPGRADE SAILFISH THEME. IT COULD EVEN DELETE THE BLANCO ICON FILES. I AM NOT RESPONSIBLE FOR ANY ISSUES.

mv /usr/share/themes/sailfish/meegotouch/icons /usr/share/themes/sailfish/meegotouch/icons.old
ln -s /usr/share/themes/blanco/meegotouch/icons /usr/share/themes/sailfish/meegotouch/icons

Edit: You need to reboot the system to take effect.

Do it on your own risk!