This is huge. Let's just hope it doesn't turn out to be yet another nothing-burger:
To this end, instead of modifying spacetime, the theory - dubbed a "postquantum theory of classical gravity" - modifies quantum theory and predicts an intrinsic breakdown in predictability mediated by spacetime itself. This leads to unpredictable fluctuations in spacetime, larger than those predicted by quantum theory. Thus, the weight of objects becomes unpredictable with precise measurements.