In debian bullseye, preinst and postinst script leave the current ruleset alone.
The ruleset lives in the kernel: it doesn't really make sense to flush and reload it just because something changed in the userspace utility.
In debian bullseye, preinst and postinst script leave the current ruleset alone.
The ruleset lives in the kernel: it doesn't really make sense to flush and reload it just because something changed in the userspace utility.