I would agree on making the default zone to be "trusted zone" because it is completely open - see man 5 firewalld.zones -for more info
$firewall-cmd --set-defualt-zone=trusted
$firewall-cmd --reload
$firewall-cmd --get-default-zone => that should show you trusted as your current default zone and you NIC interface s attached to it
** remember => the zones have 0ne-Many relationships i.e. NIC interface can ONLY belong to one ZONE but a ZONE can have many interfaces attached to it.
in my ignorance "must be open" -> "must be installed but not block anything"
sudo firewall-cmd --set-default-zone=trusted
sudo firewall-cmd --reload
sudo firewall-cmd --list-all
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