Espruino original <> ESP32 serial communication

I switched board to another one (NODEMCU ESP32), switched to GPIO16/17, and did a simple test

ESP32:

Serial2.setup(115200,{rx:D17, tx:D16});
Serial.print("hello");

on Espruino

Serial2.setup(115200);
Serial2.on('data', function (str) {
  console.log(str);
});

//output:

l
ohel
> 

Strange. Can confirm that message sent from Espruino is received on ESP32 as entire blob instead of per character...