Breakpoint in QThread::run override is not working for all threads

When running the QThread::run breakpoint test case from the list of manual test cases with the simple_test_app and placing the breakpoint on the line:

std::cerr << j;

the breakpoint only gets hit 6-7 times. Hot sure this is a big, but I would expect it to always break there (so 14 times because auf 14 threads being started).