Debuggerview shows wrong values

There is a function returning a std::optional

struct Foo {
    qsizetype a;
    qsizetype b;
}

std::optional<Foo> myFunction() {
    return Foo {.a = 1, .b = 0};
}

The convenience view show the value as 0

but the actual value, when disabling the debugger helpers via context menu, is 1