TIL That there's a skill more desync prone than Cyclone.

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Skyforth wrote:

This results in monsters on screen being hit, while monsters on server are not because it's intrinsically RNG. I doubt they can keep every single Spark in sync with the server, and thus monsters end up teleporting on client side because they weren't supposed to be hit (or be there) in the first place.

That's not how (pseudo) random number generator works. It's enough that both client and server's generators have the same seed, then the sequence of numbers produced by both generators will be exactly the same if they use the same algorithm.

That said, I also experienced a bit of desync when playing with Spark so something must be off.