After upgrading to 8.0.200 or 8.0.201, you are unable to customize the firewall rule configuration with the option Only allow connections from the following networks' on ESXi hosts.
From Vsphere 8.0 Release notes Vsphere vcenter server 80u2a-release-notes
Starting with vSphere 8.0 Update 2, you cannot customize the firewall rule configuration with the option "Only allow connections from the following networks" on ESXi hosts. For example, in the VMware Host Client, when you navigate to Networking > Firewall rules, select DHCP client, provide an IP, and check Only allow connections from the following networks, the operation fails with an error such as Operation failed, diagnostics report: Invalid operation requested: Can not change allowed ip list this ruleset, it is owned by system service..
This is expected behavior.
esxcli network firewall ruleset allowedip list
esxcli network firewall get
From Vsphere 8.0 Release notes Vsphere vcenter server 80u2a-release-notes