MAC + Flutter web + VSCode

I’m using Flutter from 2 years on my mac to dev web app without any troubles.
From today, when I launch my app in debug mode, when the code reaches a breakpoint, in VSCode appears the pause symbol, but I can’t see any variables. I’ve tryed in many ways to solve the issue without success. I also tryed with a new sample app; same trouble. Also using Android Studio; same trouble. If I debug on iPhone emulator, debug works fine.

Any help will be appreciated.
Thanks in advance.
Peter

what flutter sdk version is in question?