Comment # 11 on bug 978593 from Michael Chang

I think the major reason contributed the issue here is that you have to make
sure grub2-install running after /etc/default/grub settings are all set. It's
not only for btrfs path scheme but also for the disk cryto and distributor
settings (yes, grub2-install actually some read settings from
/etc/default/grub).

The pbl script may get run from package post script before /etc/default/grub is
written by yast. And yast did not install the loader with the same '--no-nvram
--removable' so that it didn't get corrected by yast.