From a physics point of view should be as every effect is caused by previous state. And next tick is always next tick, except quantum bacause has some randomness, but let’s assume it’s a seeded randomness.

I think every tick is predictable from previous state. Inevitable. Therefore I really like how you put it: mind is just spectating.

That doesn't answer the question though.

If a rock starts moving in one tick, it affects other things in the next tick. Despite being deterministic, that rock is not a spectator.

So if the mind is a spectator, it's not for that reason, it's some other reason.

But the rock moves that way because of the previous tick. Doesn’t “just start” or do something that’s not fitting with previous tick state

Yes. That doesn't make it a spectator. The rock is a participant in the predetermined progression.

The "spectator mode" thing you replied to was a totally different concept, where the "mind" is some weird parasite to your brain and you'd walk and talk the same even if you didn't have a "mind". Which is quite a weird idea in my opinion.