something went wrong with USB iJack data in kernel 6.x

[Paul Davis <paul@xxxxxxxxxxxxxxxxxxxxx>]

I don't know where to start with this issue, but since I noticed it
trying to use a MIDI device, I thought I would start here. Advice on
where to take it would  be much appreciated.

High Level symptoms:

1. plugin in a Novation Lanchkey mk4 to (a) a system running kernel
6.x (b) a system running kernel 5.x
2. run aplaymidi -l or arecordmidi -l

  Results:
     (a) kernel 6.x: note the presence of two identical MIDI port
names for the device
     (b) kernel 5.x: note the presence of two differently named MIDI
ports for the device

Mid-level diagnosis:

Run lsusb -v on both kernels. For 5.x, note that the iJACK displays
include a string for the MIDI port name. For 6.x note that this string
is missing.

Working with devices bearing identical ports for multiple names ranges
from extremely difficult to impossible.

I have no idea what layer of the stack can be involved here, other
than that it is not hardware. I've run both 5.x and 6.x kernels on the
same system.