This example reproduces an issue when debugging projects that use Rumtime Packages on the Win64 platform.
Steps to reproduce the issue:
1 - Open the project group: BPTEST.groupproj;
2 - Select the debug configuration and the win64 platform for all projects in the group;
3 - Make a Build;
4 - In the App.exe project in App.dpr, place a breakpoint on the line: Application.Initialize;
5 - Press F9, and we will see that the breakpoint was ignored.
If we repeat the process with the win32 configuration, the breakpoint works correctly;
If in App.dpr we remove the MyUnit unit from uses, which is part of TrPartUnits.bpl, the breakpoint also works correctly even in win64;