Comment # 11 on bug 1190920 from Petr Tesa������������k

No, I'm sorry, the na������ve fix _does_ break version from the image name if
/boot/vmlinuz is used. This happens if the currently running kernel is not
installed under /boot, e.g. when the installer installs a different kernel
version than the one that the one from the install image. This happens in Leap
and SLE as soon as the first kernel maintenance update is published.

I have now fixed this bug properly in upstream. About to send a pull request to
Factory.