BluetoothLE extension version 20230728 MTU not working for writes

Hi to all, my name is Emilio,
I am using BluetoothLE extension version 20230728 to communicate with an Arduino NANO 33 BLE.
My problem is that I set the MTU to 200 bytes using "RequestMTU" block and after this i can read strings with lenght up to 200 bytes, but if I write a string using "WriteStringsWithResponse" the string is always truncated to 20 bytes.
If I use the "nRF Connect" APP from Nordic the NANO33 receives and sends strings up to 200 bytes