Virt-install error: can't load ignition file

I'm trying to install Fedora CoreOS using virt-install, as described here: https://docs.fedoraproject.org/en-US/fedora-coreos/getting-started/ The exact command I'm running:

-install --connect qemu:///system -n fcos -r 2048 --os-variant=fedora31 --import --graphics=none --disk size=10,backing_store=fedora-coreos-31.20200310.3.0-qemu.x86_64.qcow2 --qemu-commandline="-fw_cfg name=opt/com.coreos/config,file=/home/test/Downloads/example.ign"

is returning this error:

install...
Allocating 'fcos.qcow2'                                                                                              |  10 GB  00:00:00     
ERROR    internal error: qemu unexpectedly closed the monitor: 2020-04-05T14:52:47.919380Z qemu-system-x86_64: -fw_cfg name=opt/com.coreos/config,file=/home/test/Downloads/example.ign: can't load /home/test/Downloads/example.ign
Removing disk 'fcos.qcow2'                                                                                           |    0 B  00:00:00     
Domain installation does not appear to have been successful.

I'm running this command as root. The ignition file is working as I've successfully used it to deploy this VM from an iso file.