Break on Data Access at Fixed address, confusing user interface

[Cedric-air]

I would like to set a breakpoint that fires when "myData" changes. This works fine, but qtcreater makes 2 breakpoints, and the properties window of the breakpoint confuses me.
I have this code:
main.cpp:

#include "mainwindow.h"

#include <QApplication>

int myData = 0;

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    myData = 1; //break on this line please
    w.show();
    return a.exec();
}

I can place a breakpoint on the line myData = 1, and qt indeed breaks correctly:

I would like to set a data breakpoint, that reacts to the data being changed. After creating an expression evaluator, I was able to create the breakpoint:

This creates two breakpoints, one with the function "-", and one with the function "Data at myData". This breaks correctly directly after the instruction that alters myData:

The top breakpoint has the fields I expect: (Expression: myData):

The bottom breakpoint is empty:

My versions:
Qt creator 12.0.1
based on Qt 6.6.1
GNU gdb (GDB) 13.2
Arch linux, Xorg, LXDE:
$ uname -a
Linux cedric-work-laptop 6.6.10-arch1-1 #1 SMP PREEMPT_DYNAMIC Fri, 05 Jan 2024 16:20:41 +0000 x86_64 GNU/Linux