No channels available on Rodecaster Duo

[SturmB]

Plugin Version

v3.2.1f

Describe the bug

Even though the Rodecaster Duo is set to "Pre-fader" for its Multitrack USB 1 Output, the only choice shown in the plugin for a channel is "Mute."

To Reproduce
Steps to reproduce the behavior:

1. On the Rodecaster Duo (firmware version 1.5.4), go to "Settings" > "Outputs" > "Multitrack" > "USB 1 Output" and select either "Pre-fader" or "Post-fader."
2. In Windows 11 (version 26100.4652), install v3.2.1f of the obs-asio plugin.
3. Run OBS (version 31.1.1).
4. Add a new "ASIO Input Capture" source.
5. Select "RODECaster" from the "Device" dropdown.
6. Open the dropdown for any of the "OBS Channel"s.
7. See that only "Mute" is available.

Expected behavior
I expect to see the 15 or 16 channels that the RODECaster Duo is outputting when Multitrack is turned on.

Screenshots

Additional context
I installed the RØDECaster Series ASIO Driver before the OBS Plug-in, in case that was necessary.