Unity Online Multiplayer

I’m starting a new Fighting Game project that I want to use to learn how to implement rollback netcode.
The game uses Unity physics, which I’ve heard is non-deterministic because of floating point math.
Does this mean I need to create my own/use a physics system based on fixed point numbers? Or does it not really matter in practice?
How do people even make online multiplayer games in Unity if the physics isn’t deterministic?

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