[Note] Reproducible only with MSVC/CDB toolchain.

Consider, for example, the following situation:

• Create a GUI app. (MSVC); Build it; Start debugging; Close app.
• Create another GUI app. (MSVC); Set it as the current project in Creator; Build it; Start debugger.

Result: Apparently the debugger starts but is shut down right afterwards (so the app. cannot be debugged). From the log (attached) it looks like there is some kind of session duplication. So when I close Creator it tells me about an active debugging session.