Verified with CNV v4.12.5-23 with the following cases:

1. In a 6 node cluster ( 3 master, 3 worker ), created a fedora VM.
2. Run must-gather
# oc adm must-gather --image=<image> -- /usr/bin/gather --vms_details
3. Check for the contents of ruletables.txt file
# cat must-gather.local.4129534662964224807/<image_name_in_registry>/namespaces/default/vms/fedora-x2mgi1jb1h3es5ia/virt-launcher-fedora-x2mgi1jb1h3es5ia-tshm2.ruletables.txt
table ip filter {
	chain INPUT {
		type filter hook input priority filter; policy accept;
	}

.....

The expected file is available and its has the right set of contents available.

Repeated the test by running the must-gather pod on the node where VM is running.
1. Find out the node, where the VM is running
2. Run must-gather with '--node-name=<node-where-vm-running>'
# oc adm must-gather --node-name=<node-name> --image=<image> -- /usr/bin/gather --vms_details
table ip filter {
	chain INPUT {
		type filter hook input priority filter; policy accept;
	}
The expected file is available and its has the right set of contents available.

Based on the above observation, marking this bug as VERIFIED

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Important: OpenShift Virtualization 4.12.5 security and bug fix update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2023:4421