Comment 34 for bug 2011806

There is a theoretical race, yes.

The landed patch was a somewhat "lite" and invasive version of introducing the concept.

What you describe is how systemd-run does it.

But there's a much simpler solution, we can just use startTransientService(execLine) instead of startTransientScope(somePid) then it all becomes someone else's problem.

See:

https://invent.kde.org/frameworks/kio/-/merge_requests/71