Arduino STM32 ILI9341 touch not working

I also added the lv_example_btn_1() example from the documentation with the following in event_handler() for some visual feedback:

digitalWrite(LED_BUILTIN, !digitalRead(LED_BUILTIN));

The buttons are displayed, but the LED does nothing when I touch either of the buttons.

In the serial terminal, only the following is displayed:

Hello Arduino! (V8.0.X)
I am LVGL_Arduino
Setup done

:confused: