Warning when using `packed_bits` on a field wider than u8. about usbd-hid HOT 1 OPEN

#[gen_hid_descriptor(
    (collection = APPLICATION, usage_page = GENERIC_DESKTOP, usage = JOYSTICK) = {
        (usage = X,) = {x=input;};
        (usage = Y,) = {y=input;};
        (usage_page = BUTTON, usage_min = BUTTON_1, usage_max = BUTTON_8) = {
            #[packed_bits 8] #[item_settings data,variable,absolute] buttons0=input;
        };
        (usage_page = BUTTON, usage_min = 9, usage_max = 10) = {
            #[packed_bits 2] #[item_settings data,variable,absolute] buttons1=input;
        };
    }
)]
pub struct InputReport {
    pub x: u8,
    pub y: u8,
    pub buttons0: u8,
    pub buttons1: u8,
}