Standard C++ object "<not accessible>" during debugging session

In a debugging session for the code below the variable "std::string test" gets its value set to "<not accessible>" while QString one is fine.

#include <QString>
#include <iostream>

int main(void)
{
	QString test1("test1");
	std::string test("test");
	return 0;
}

I've tested this same code with QtCreator 4.9.1 and had the same issue. I installed Qt dev tools/libs via its online installer:

Qt version = 5.13.0

QtCreator version = 4.9.2/4.9.1

C++ toolchain version = GCC-C++ 9.1.1

GDB version = 8.3

Linux distro = Fedora 30

Some other bugs were already opened with somewhat the same kind of issue (i.e. QTCREATORBUG-21321), but none of them really helped me to solve this bug in particular. Attached are both logs (right and left windows) from debugger view.