Indeed I had v1.15 and v1.29, see my feedback when posting the logfile.
The snap installed but never used in the daily routines, the pip installation was the one being called and updated.
Indeed the plugin was being ignored while in fact installed.
I noticed, after removing everything and installing things again, the first step:
sudo apt-install python3 python3-venv libaugeas0
Said that python3 and python3-venv were already installed (correclty so since I didn't go that far to also remove python3 from my RPI). But libaugeas0 was getting installed. So previously that package was not on my system. Could that be a hint ?