Yes, it isn’t possible for God to both be omniscient and to be ignorant of the results of some “random number generator” that He created.
So you can have God, or you can have randomness, but you can’t have both.
That's called 'free will'.
An omnipotent God can decide that being omniscient is really, really boring, and elect to not look ahead and 'just see what the monkeys are doing' today.
I'm pretty sure if there is such a being He finds my life amusing (as do I!)...