[FS#1497] Port Forwarding /etc/config/firewal does not work

[LEDE Bugs]

The following task has a new comment added:

FS#1497 - Port Forwarding /etc/config/firewal does not work
User who did this - Bento Alves Cerqueira Cesar Neto (BentoAlves)

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Using `iptables -t nat -nvL` the rules also were not appearing.
I did a factory reset and I installed the firmware and it worked again, it was probably some package that I had previously installed that might have affected this.
Thank you.
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=1497#comment4612