This is a completely different test from the 4.21 one (260389). In the 4.21 one you just had a sphere falling vertically and held back by a cable (limited along Z, locked along X and Y). Here you have two spheres that are apparently nudged by a falling third one and are (apparently?) supposed to start swinging after that. The single ball was clear enough, but here I no longer understand what you want to do. If you want to allow the spheres to swing, then why lock them along X and Y?