Wrong resolution of dynamic downcast in struct

struct Base1
{
    virtual ~Base1() {}
    int foo = 42;
};

struct Base2
{
    virtual ~Base2() {}
    int bar = 43;
};

struct Derived : Base1, Base2
{
    int baz = 84;
};

struct Container
{
    Container(Base2 *b) : b2(b) {}
    Base2 *b2;
};

int main(int argc, char *argv[])
{
    Derived d;
    Container c(&d); // c.b2 has wrong address
    Base2 *b2 = &d; // This has the right address
    return 0;
}