A firewalld BugFix Update has been released for CentOS 7.

CentOS Errata and Bugfix Advisory 2020:0384

Upstream details at :   https://access.redhat.com/errata/RHBA-2020:0384

The following updated files have been uploaded and are currently
syncing to the mirrors: ( sha256sum Filename )

x86_64:
25a34351872446f676ef70a76ef4dbe72d05e13c9700aa69e6419bf8919e63b6 firewall-applet-0.6.3-2.el7_7.3.noarch.rpm
c4a84f84e1672f83dff87d55cf43e00dadc0f25e8d4c540c16477137c79efc91 firewall-config-0.6.3-2.el7_7.3.noarch.rpm
ad3a9f2a6f6a9f874e4a267566ea611ca72c0f52a3747cae7e2e27296cf9fe8c firewalld-0.6.3-2.el7_7.3.noarch.rpm
1fb16226eb83d5e0cbce981903410d69e7d4bd60bc769f5d64cb737f74d01454 firewalld-filesystem-0.6.3-2.el7_7.3.noarch.rpm
3342c3e03c6918e012962baa6945bc85910383fc843d43ccd5f9b0c7efac4b4a python-firewall-0.6.3-2.el7_7.3.noarch.rpm

Source:
56949b84db1c9d5149f411dad3bc07ac8874afcbbf230011bb27fa7a9a353775 firewalld-0.6.3-2.el7_7.3.src.rpm