WriteLEDText not working in the microbit extension

Hi.
The function WriteLEDTex from the SimpleMicrobit extension is not working.
Somethimes the screen is just turned off.
Other times the app crashes without saying why.

Extensions:
I am using this bluetoothLE extension:

Download the BluetoothLE extension (version 20200828)
iot.appinventor.mit.edu/assets/resources/edu.mit.appinventor.ble-20200828.aix
Found here:
iot.appinventor.mit.edu/#/bluetoothle/bluetoothleintro

The microbit extension is this one:
Download the BBC micro:bit extension
iot.appinventor.mit.edu/assets/resources/SimpleMicrobit.aix
Found here:
iot.appinventor.mit.edu/#/microbit/microbitintro

Code:

Here is my app:
BluetoothBL_Microbit_example.aia (304.4 KB)

And here is an example code from the makecode:


( It looks like the flags about pairing are not working as they should. )

Tutorials:
To connect the bluetooth I used this tutorial:
drive.google .com/file/d/0B51cwz24uqobanJ2XzhLbGpQOFk/view?resourcekey=0-A5MBkOxnWL2Wlgm_xbaEQA

To write to the microbit I used this one:
iot.appinventor.mit.edu/assets/howtos/MIT_App_Inventor_Microbit_LED.pdf

Preview of microbit code:
image

Preview appInventor code: