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Leading to them colliding with edge of generated chunks causing extra chunk explosion particles.

Edit: Checking a few other platforms, it's not just upwards component that lives, though does seem majority do have upward component.

Thanks for the report. Asteroid chunks always do this when colliding with un-generated chunks regardless of which direction they're moving.

Actually, I was wrong. I was looking in the wrong location. I've changed asteroid chunks to simply vanish when hitting un-generated chunks instead of exploding.