I tried to put breakpoints in Dart SDK code but those breakpoints are ignored.

To reproduce this I setup an environment with :

• A fresh SDK installation : Dart SDK version: 2.15.0-68.0.dev (dev) (Wed Sep 1 05:51:32 2021 -0700) on "linux_x64"
• A fresh Dart project created from DartCode command Dart: New Project and selecting simple-console template
• Try to put a breakpoint in print source code

I used two ways to put this breakpoint :
1 - Using 'Go to definition' and add the breakpoint
2 - Launching a debug session and 'Step into' to reach Dart SDK source code and add the breakpoint

Two breakpoints were created with different paths, neither works :

DartCode debugging logs :
Dart-Code-Log-2021-08-05 13-41-24.txt

Corresponding session in video :
https://user-images.githubusercontent.com/840911/132003058-ce293e04-b9d7-4642-bc9e-2889701ea086.mp4