Relativity and quantum mechanics do not agree with each other, so something is wrong somewhere.
One is a description of a macro world built along classical lines, the other is a description of a world behind the classical world, so to speak, so there is no reaosn why they should agree.
Its a bit like expecting the workings of a computer to obey the geometry of a picture displayed on its monitor.
Quantum reality is not a 'part of' classical reality. Classical reality is the observation of quantum reality on a macro scale.
Cart before horse.