Sketch for PS2 not detected as /dev/input/jsX

[NetBUG]

Hello!
The project looks very cool and promising, but I got stuck with HID core.
I am using RetroJoystickAdapter_Playstation.ino, and in debug mode it seems to work fine, joystick state can be easily read from the console.

When I plug it in, /dev/input/mouseN+1 appears, but not jsX device.
What am I doing wrong?

The sketch does not use Joystick2 library, is that correct?

This is my first time touching HID devices with Mega32U4, so sorry for stupid questions

[NetBUG]

Update: the example for Joystick library works fine and is detected as /dev/input/js0.

Unfortunately, I am a little lost in the code for PS2, I don't get why there are four separate joysticks, what is multitap.
Since the signature (hidReportDescriptor) was changed to handle less data in PS2 demo, it's hard to make direct comparison

P.S. I have a Chinese wireless joystick for PS2, and have never played any of Playstations, I just need it as a remote control for a robot.