To reproduce:

1. Create new project
2. Create new c++ file:
#include <stdio.h>

int main(int argc, char**argv) {
   int i;

   printf("Enter some integer: ");
   scanf("%d", &i);
   printf("i is %d\n", i);
   
   return i;
}


3. Run the project 
4. While program is waiting for user input switch to Runtime Explorer and
terminate the process

You can see no processes in Runtime Explorer but external window with program
running is still open and alive.