This bug was fixed in the package iptables-persistent - 1.0.14ubuntu1
---------------
iptables-persistent (1.0.14ubuntu1) focal; urgency=medium
* Add configuration options IP[6]TABLES_RESTORE_NOFLUSH so that
existing rules are not flushed on start/load (LP: #1949643)
- debian/netfilter-persistent.default: Introduce options
- plugins/{15-ip4tables,25-ip6tables}: Check/apply options
-- Jorge Merlino <jorge.merl...@canonical.com> Fri, 10 Dec 2021
09:55:20 -0300
** Changed in: iptables-persistent (Ubuntu Bionic)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1949643
Title:
iptables-persistent unconditionally drops existing iptables rules
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