dvrescue only able to see one DV device - Ubuntu

[archisysio]

I'm running Ubuntu 22.04.4 LTS and would like to use vrecord to capture from multiple DV decks at the same time. However, the application only sees one DV device when I have multiple devices connected to the system.

I've tried different combinations of devices without any luck: HVR-1500As, DSR-1500As, and DSR-40s.

I currently have two HVR-1500As connected:

vrecord01@vrecord01:~$ grep . /sys/bus/firewire/devices/fw*/*_name
/sys/bus/firewire/devices/fw0.0/model_name:DV-VCR
/sys/bus/firewire/devices/fw0/model_name:HVR-1500
/sys/bus/firewire/devices/fw0/vendor_name:Sony
/sys/bus/firewire/devices/fw1/model_name:Juju
/sys/bus/firewire/devices/fw1/vendor_name:Linux Firewire
/sys/bus/firewire/devices/fw2/model_name:Juju
/sys/bus/firewire/devices/fw2/vendor_name:Linux Firewire
/sys/bus/firewire/devices/fw3.0/model_name:DV-VCR
/sys/bus/firewire/devices/fw3/model_name:HVR-1500
/sys/bus/firewire/devices/fw3/vendor_name:Sony

But dvrescue only sees one:

vrecord01@vrecord01:~$ dvrescue -list_devices
0x8004602012c0faf: Sony HVR-1500 [DV]

Version info:
vrecord01@vrecord01:~$ dvrescue --version
DVRescue v.24.07 (MediaInfoLib v.24.06) by MIPoPS.

Please let me know if you need any additional info.