Debugging Blazor Addin project

Debugging a project build on the "Blazor Addin" template gives me hard time.

1. Break points for C# are not available for C# on the Blazor Addin templates, while you have them on any basic Blazor projects from "Visual Studio/create a project". It is a constraint but you can still get around using console.Writeline("").
2. Break points for JS are available for JS. But
   - JS changes are randomly not updated (notably on an error but I cannot guarantee) :
   -- visual basic actually run the previous code
   -- breakpoints turn from red to yellow (not accessible) and sometimes disappear
   -- on some conditions (I didn't understand which!) a window named "localhost:7287 [dynamic] appears on the right side with the previous code; this window being readonly.
   - Afterward the project sticks on this previous JS code whatever you try : close the project, reboot machine, empty WEF or Bin folder, hit CTRL F5, activate debug for javascript ...
   - This behaviour expands to the other projects based on this same template that exists on your machine.
   - Changing the launchsettings applicationURL ( 7283, 7287, 7288 and 7289) gives you another try but inevitably you finish to
   spoil all these avalaible URL.
   - This behaviour desappears after hours or few days but I don't know whether it is spontaneous or due to tries I doing to solve it.

This behaviour seems to worsen with the size of the code.
Question
I am looking for any suggestion on how to handle this issue and