Hello.
I'm replying to myself: it seems that the ticket is still open and ultimately still being processed.
Let's wait and see...
https://gitlab.com/ubports/development/ubuntu-touch/-/issues/2238
@lduboeuf
Thanks for the answer Lionel.
Well, i have made some tries but without success.
Finally, i have remove the pip3 install of 8.3.1 and reinstall with snap and now it's working.
There was something wrong with the blob fdc55cec6c2e