Workaround!!! Here I am again. I found a workaround for the PipeableOSProcess and the Big Sur update. It is the usage of LibC, I was not aware of that class, it's useful. I was able to reproduce my logic with LibC, this article (https://fuhrmanator.github.io/2019/03/16/LibC-Pharo-experiments.html) is recommended.
Cheers Davide
