strange grub.rpmnew after update

English Install/Boot/Login
1

I have a grub.rpmnew file from 11/08/2016
One would expect to replace /etc/default/grub with the new file, but the problem is that it does not appear fully configured, for example:
GRUB_CMDLINE_LINUX_DEFAULT is empty (missing “quiet splash=silent resume=/dev/sda5 splash=silent quiet showopts”)
the following options are all missing:
GRUB_BACKGROUND=/boot/grub2/themes/openSUSE/background.png
GRUB_THEME=/boot/grub2/themes/openSUSE/theme.txt
SUSE_BTRFS_SNAPSHOT_BOOTING=“true”
GRUB_USE_LINUXEFI=“true”
GRUB_DISABLE_OS_PROBER=“false”
GRUB_ENABLE_CRYPTODISK=“n”

so the question is, why would an update present me with an unconfigured grub file, and what do I need to do to ensure my current grub file is in line with TW defaults?

2

*.rpmnew are files, shipped with package. In this case it is default file that does not have any customization. Bootloader configuration updates this file, so package manager stores copy to not overwrite local changes.

And no, you are not supposed to blindly replace original files with *.repmnew versions. You are supposed to merge them if necessary after examination.