GDB crashes if boolean variable is uninitialized and not used

When I run the debugger on a C++ project, GDB crashes if one boolean variable has not been initialized upon declaration and is not used in the program, but I set a breakpoint before the 'cout'.

The crash disappears if I either add CREATE_DICOMS to the std::cout line, even if it is uninitialized, or alternatively if I initialize the value upon declaration and do not use it later.

In contrast, if I run gdb directly from command line, it works always. Here what it says at the breakpoint:

(gdb) print CREATE_DICOMS
$1 = <optimized out>
(gdb) print CREATE_FOLDERS
$2 = true

So what I am thinking is that somehow this 'optimized out' result is not correctly being parsed by QtCreator and it leads to a crash.

Here the reproducer code bth.cpp

#include <iostream>

int main(int argc, char** argv)
{
 bool CREATE_FOLDERS=true;
 bool CREATE_DICOMS;

 std::cout << "Folders: " << CREATE_FOLDERS << std::endl;
 return 0;
}

And the CMakeLists:

cmake_minimum_required(VERSION 3.10)
project(raystretch-clinical LANGUAGES CXX)
add_executable(bth bth.cpp)