Same here: We’ve been testing Twinmotion 2025.1 on macOS Silicon Processors (M2, M3, Pro, Max), and unfortunately, it’s been extremely unstable. The application crashes repeatedly during basic in the whole class (25 students+) import —editing materials, even saving… It’s reached a point where it’s nearly impossible to get any meaningful work done. 
Due to this, we’ve had to roll back to Twinmotion 2024 to continue our projects without interruption. While we’re excited about the new features in 2025.1, stability is key, and right now it’s just not there on Mac.
We love TM and we’re hoping for a fix or a more stable update soon.
Thanks
IBFHNW