hi.
i just read the README of hibernate-script (<grumble> i had to download the source to read the doc since i coudn't even have some descent doc with arch package</grumble>)

'''Additionally, the hibernate script will look for a particular file before
suspending (/var/run/suspend2-new-kernel) and if it is detected, will refuse to
suspend. The idea is that your installation scripts for new kernels create
this file, which prevents you from hibernating until you have booted your new
kernel (or you remove the file manually if you know what you are doing). For
example, kernel packages compiled with the Debian kernel-patch-suspend2 patches
do this upon installation.'''

Why does the arch suspend2 kernel package not do that ???

It will avoid a suspend with hibernate script while a new suspend2 kernel has just been installed , a new one that will not allow to resume !

it is a matter of adding a if...fi in post_upgrade and post_install in install file

post_upgrade() {
if pacman -Q hibernate-script 2>/dev/null ;then
touch /var/run/suspend2-new-kernel
fi
}

the problem is now to remove that /var/run/suspend2-new-kernel on the next boot. but there must be a way to do that cleanly !