Stm32h750: own UAC2 Class does not enumerate the first time on windows

[sx107]

I am learning the UAC2 class, and decided to write my own similar to the audio class one (uac2_speaker_fb) and skip all the descriptor parsing. On Linux everything is fine, but on Windows the device does not enumerate the first time it is plugged in - but it does if I keep the power and replug it. init, reset callbacks are called, descriptor is asked, and is read fine, but the interface is never set, the open callback is also never called. Again, after replugging everything works. What am I doing wrong? Here is init and reset code:

void uac2_init(void) {
	tu_memclr(&hnd, sizeof(uac2_handle));
	hnd.ctrl_buf = ctrl_buf_1;
	hnd.ctrl_buf_size = CFG_TUD_AUDIO_FUNC_1_CTRL_BUF_SZ;
	hnd.alt_setting = 0;
	hnd.sample_rate = 48000;
	hnd.muted = 0;
	hnd.feedback_value = 0x60000;

	tu_fifo_config(&hnd.ep_out_ff, audio_ep_out_sw_buf_1, AUDIO_FIFO_SIZE, 1, true);
	//tu_fifo_config(&hnd.ep_in_ff, audio_ep_in_sw_buf_1, AUDIO_FIFO_SIZE, 1, true);

	tu_fifo_clear(&hnd.ep_out_ff);
	//tu_fifo_clear(&hnd.ep_in_ff);
}
bool uac2_deinit(void) {
	//tu_fifo_clear(&hnd.ep_in_ff);
	tu_fifo_clear(&hnd.ep_out_ff);
	return true;
}
void uac2_reset(uint8_t rhport) {
	hnd.sample_rate = 48000;
	hnd.muted = 0;
	hnd.feedback_value = 0x60000;

	tu_fifo_clear(&hnd.ep_out_ff);
	//tu_fifo_clear(&hnd.ep_in_ff);
}

Whole source code here: https://github.com/sx107/stm32-tinyusb-uac2-examle

UPD: Just confirmed. The same behavior is with the included UAC2 in uac2_speaker_fb - first time it does not enumerate, second time it does.
Init code:

int main(void)
{
  HAL_Init();

  SystemClock_Config();

  MX_GPIO_Init();
  MX_USB_OTG_HS_PCD_Init();
  tud_init(BOARD_TUD_RHPORT);

  while (1)
  {
    /* USER CODE END WHILE */
	  tud_task();
    /* USER CODE BEGIN 3 */
  }
  /* USER CODE END 3 */
}