There is no RNG dedicated to your rolls. There isn't even a dedicated crafting RNG or gathering RNG or whatever. Let's say an alleged RNG simply generates the sequence '89X9 91' forever. Therefore the first 9 rolls are guaranteed to succeed with 90% chance to succeed and the last roll is guaranteed to fail with 90% odds. There's nothing random about this sequence, though it satisfies succeeding 9 out of 10 times with 90% odds.
Now say you're trying to take advantage of this. You can't, because a guy shooting an arrow at a mob will randomly use up one of these numbers, so is the other guy getting hit by a sheep elsewhere, and in fact virtually every action in the game uses up a RNG, so despite you know the exact sequence of numbers generated, it is never possible for any one player to observe any pattern even if there is supposed to be one.