I have this code where the I call member functions on a temporary object of Test class

not production code: https://godbolt.org/z/8YW7EqEf6

    const auto &t2 = Test().withT1().withT2();
    testParam(t2);

With the above function calls to withT1 and withT2 the temporary object gets destroyed immediately. And, a destoryed object (t2) is sent to the function testParam

However, if I do not call the member functions withT1 and withT2 the temp object, it is assigned correctly to reference variable t2, and holds it lifetime until end on block scope.

not production code: https://godbolt.org/z/9hEanEeGY

Can someone please help me understand why the compiler behaves this way?