postinst.d/99-default script doesn't seem to work - Fedora kernel become the default one after update

After last two Fedora kernel updates yesterday and today, I noticed each time it became a default kernel to boot. I have the /etc/kernel/postinst.d/99-default script in place with correct set of permissions.

When I execute grubby --set-default=/boot/$(ls /boot | grep vmlinuz.*cachy | sort -V | tail -1) manually, Cachy kernel becomes the default one again.