Researchers studying quantum materials, particularly around the Mott-Ioffe-Regel (MIR) limit, have made a groundbreaking discovery.Experiments on single crystals of CaAs3 challenge the conventional understanding of electron transport near the MIR limit.Observations of quantum oscillations and unusual sign reversals suggest significant electron coherence persists in systems nearing the MIR limit.The research opens new conceptual pathways for exploring strange metal phases and has implications for material science and quantum physics.