Visual Studio Code debugger not catching breakpoint in first Flutter template app (running on Google Chrome))

I am trying to figure it out why while debugging in Visual Studio Code the first template Flutter app the debugger is not catching the instruction:

_counter++;

_counter--;

Here, I am attaching the debugging process, I am expecting the debugger to hold breakpoint on every line that I have selected breakpoint. The breakpoint only activates on line 64. It does not activates on line 63 and 65, why is that?

The issue only occurs when running program in Google Chrome (web app). It does not occur when running on android emulator.
In addition, the same program in Android Studio while debugging the debugger holds on line 62, 63, 64 and 65 while running in Google Chrome