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By utilizing the thin shell approximation, we investigate the behavior ofradial timelike geodesics in a black hole to white hole bouncing scenario witha mass (de-)amplification relation. We show that those geodesics lose energyafter crossing the transition surface if the white hole mass is less than theblack hole mass and vice versa. That is, the bounded timelike radial geodesicsbecome closer to the event horizon in the mass decreasing direction. We thenshow that by tracing a finite amount of bouncing cycles along the massdecreasing direction, all bounded radial geodesics can be squeezed into therange of the stretched horizon while the black hole and white hole are stillmassive. Those highly squeezed geodesics are problematic since there exists aPlanck-scale blueshift between them and the regular infalling trajectories. Wealso discuss the possible implication and rescues.

Trouble with geodesics in black-to-white hole bouncing scenarios