TUH not receiving Consumer Control reports?

[pseud0sphere]

I have a TinyUSB dual host/device running on a Raspberry Pi Pico. The host receives input from a keyboard that poses as multiple interfaces, and the device prints out the reports called from tuh_hid_report_received_cb to a TUD CDC endpoint, among other things.

I can see that the TinyUSB host has all three interfaces properly mounted, and I can see it receiving inputs on all 3 interfaces by reading the output on the device-side CDC. However, on interface 1, there should be HID reports received on report ID 3 (consumer control - should be volume controls) and report ID 5 (vendor defined - I don't think it's relevant but it's key up/down messages), but I am only seeing them received by tuh_hid_report_received_cb for report ID 5.

These are the inputs that I can see are sent when the keyboard is plugged in directly to a PC by looking at /sys/kernel/debug/hid/.../events.

report (size 3) (numbered) =  03 e9 00
Consumer.0000 = 0
Consumer.VolumeIncrement = 1

report (size 3) (numbered) =  03 00 00
Consumer.VolumeIncrement = 0
Consumer.0000 = 1

report (size 3) (numbered) =  03 ea 00
Consumer.0000 = 0
Consumer.VolumeDecrement = 1

report (size 3) (numbered) =  03 00 00
Consumer.VolumeDecrement = 0
Consumer.0000 = 1

And this is the relevant code within tuh_hid_report_received_cb that is outputting messages to the TUD CDC.

    if(len>0) {
        // echo HID report to CDC for debugging
        count = sprintf(tempbuf, "\n[%u] Received message on interface %u       (%u)\n", dev_addr, instance, len);
        tud_cdc_write(tempbuf, count);
        for(int i=0;i<len;i++){
            count=sprintf(tempbuf,"%02X ",report[i]);
            tud_cdc_write(tempbuf,count);
        }
        count = sprintf(tempbuf, "\n");
        tud_cdc_write(tempbuf,count);
        tud_cdc_write_flush()

        [...]

As shown below, tuh_hid_report_received_cb is getting called on reports from the keyboard on the same interface, but only for report ID=5.

[1] Received message on interface 1 (8)
05 04 0E 00 00 00 00 00

The reports on the same interface for report ID=3 do not seem to be calling tuh_hid_report_received_cb when connected to the Raspberry Pi Pico instead of directly into the PC. What am I doing wrong/is this intended behavior?

Below is the HID report descriptor on the interface in question (interface 1)

0x05, 0x01,        // Usage Page (Generic Desktop Ctrls)
0x09, 0x02,        // Usage (Mouse)
0xA1, 0x01,        // Collection (Application)
0x85, 0x01,        //   Report ID (1)
0x09, 0x01,        //   Usage (Pointer)
0xA1, 0x00,        //   Collection (Physical)
0x05, 0x09,        //     Usage Page (Button)
0x19, 0x01,        //     Usage Minimum (0x01)
0x29, 0x03,        //     Usage Maximum (0x03)
0x15, 0x00,        //     Logical Minimum (0)
0x25, 0x01,        //     Logical Maximum (1)
0x95, 0x05,        //     Report Count (5)
0x75, 0x01,        //     Report Size (1)
0x81, 0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x95, 0x01,        //     Report Count (1)
0x75, 0x03,        //     Report Size (3)
0x81, 0x01,        //     Input (Const,Array,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x05, 0x01,        //     Usage Page (Generic Desktop Ctrls)
0x09, 0x30,        //     Usage (X)
0x09, 0x31,        //     Usage (Y)
0x15, 0x81,        //     Logical Minimum (-127)
0x25, 0x7F,        //     Logical Maximum (127)
0x75, 0x08,        //     Report Size (8)
0x95, 0x02,        //     Report Count (2)
0x81, 0x06,        //     Input (Data,Var,Rel,No Wrap,Linear,Preferred State,No Null Position)
0x09, 0x38,        //     Usage (Wheel)
0x15, 0x81,        //     Logical Minimum (-127)
0x25, 0x7F,        //     Logical Maximum (127)
0x75, 0x08,        //     Report Size (8)
0x95, 0x01,        //     Report Count (1)
0x81, 0x06,        //     Input (Data,Var,Rel,No Wrap,Linear,Preferred State,No Null Position)
0xC0,              //   End Collection
0xC0,              // End Collection
0x05, 0x01,        // Usage Page (Generic Desktop Ctrls)
0x09, 0x80,        // Usage (Sys Control)
0xA1, 0x01,        // Collection (Application)
0x85, 0x02,        //   Report ID (2)
0x19, 0x81,        //   Usage Minimum (Sys Power Down)
0x29, 0x83,        //   Usage Maximum (Sys Wake Up)
0x15, 0x00,        //   Logical Minimum (0)
0x25, 0x01,        //   Logical Maximum (1)
0x75, 0x01,        //   Report Size (1)
0x95, 0x03,        //   Report Count (3)
0x81, 0x02,        //   Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x75, 0x01,        //   Report Size (1)
0x95, 0x05,        //   Report Count (5)
0x81, 0x01,        //   Input (Const,Array,Abs,No Wrap,Linear,Preferred State,No Null Position)
0xC0,              // End Collection
0x05, 0x0C,        // Usage Page (Consumer)
0x09, 0x01,        // Usage (Consumer Control)
0xA1, 0x01,        // Collection (Application)
0x85, 0x03,        //   Report ID (3)
0x19, 0x00,        //   Usage Minimum (Unassigned)
0x2A, 0xFF, 0x1F,  //   Usage Maximum (0x1FFF)
0x15, 0x00,        //   Logical Minimum (0)
0x26, 0xFF, 0x1F,  //   Logical Maximum (8191)
0x75, 0x10,        //   Report Size (16)
0x95, 0x01,        //   Report Count (1)
0x81, 0x00,        //   Input (Data,Array,Abs,No Wrap,Linear,Preferred State,No Null Position)
0xC0,              // End Collection
0x06, 0xA0, 0xFF,  // Usage Page (Vendor Defined 0xFFA0)
0x09, 0x01,        // Usage (0x01)
0xA1, 0x01,        // Collection (Application)
0x85, 0x04,        //   Report ID (4)
0x09, 0x02,        //   Usage (0x02)
0x15, 0x00,        //   Logical Minimum (0)
0x26, 0xFF, 0x00,  //   Logical Maximum (255)
0x75, 0x08,        //   Report Size (8)
0x95, 0x7F,        //   Report Count (127)
0xB1, 0x02,        //   Feature (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position,Non-volatile)
0xC0,              // End Collection
0x06, 0xFF, 0xFF,  // Usage Page (Vendor Defined 0xFFFF)
0x09, 0x01,        // Usage (0x01)
0xA1, 0x01,        // Collection (Application)
0x85, 0x05,        //   Report ID (5)
0x09, 0x01,        //   Usage (0x01)
0x15, 0x00,        //   Logical Minimum (0)
0x26, 0xFF, 0x00,  //   Logical Maximum (255)
0x75, 0x08,        //   Report Size (8)
0x95, 0x07,        //   Report Count (7)
0x81, 0x02,        //   Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0xC0,              // End Collection

[pseud0sphere]

Calling tuh_hid_set_default_protocol(HID_PROTOCOL_REPORT); before tuh_init() solved this for my device.