Description of problem:
zone bindings are not recreated on reload, if they are managed by NM. This bug was introduced with new option FlushAllOnReload set to default 'yes'.
Interfaces configured to be bound to specific zones internally in firewalld are not impacted. (zone.xml file). This binding type is not default as NM is usually running and let to manage those bindings.

Version-Release number of selected component (if applicable):
firewalld-0.6.3-3.el8.noarch
NetworkManager-1.14.0-7.el8.x86_64

How reproducible:
always

Steps to Reproduce:
(optionally set up 'br' interface and binding in zone.xml)
have NM and firewalld up
firewall-cmd --get-active-zones
public
  interfaces: eth0
work
  interfaces: br


firewall-cmd --reload
firewall-cmd --get-active-zones
work
  interfaces: br

Actual results:
interface 'eth0' is not bound to any zone (default) on reload
interface contained within internal configuration gets loaded

Expected results:
all interfaces NM/non-NM managed that are present on service start are also present after reload

Additional info: