There's nothing else to know regarding the creation other than what God decreed and created. There are no contingencies due to creatures doing what they want. There's no plan B. God doesn't learn anything new from the creation. It is exactly how He wants it to be. Literally as a potter making a clay pot. Really simple.
God cannot know what he has not determined.
The wording can come off confusing but actually we are overthinking it.
Except your idea that God has determined all the sin in the world is totally unbiblical
James 1:13 Let no one say when he is tempted, “I am being tempted by God,” for God cannot be tempted with evil, and he himself tempts no one.
James 1:14 But each person is tempted when he is lured and enticed by his own desire.
James 1:15 Then desire when it has conceived gives birth to sin, and sin when it is fully grown brings forth death.
James 1:16 ¶ Do not be deceived, my beloved brothers.
James 1:17 Every good gift and every perfect gift is from above, coming down from the Father of lights, with whom there is no variation or shadow due to change.
1Cor. 10:13 No temptation has overtaken you that is not common to man. God is faithful, and he will not let you be tempted beyond your ability, but with the temptation he will also provide the way of escape, that you may be able to endure it.
1John 2:16 For all that is in the world—the desires of the flesh and the desires of the eyes and pride of life—is not from the Father but is from the world.
Jer. 19:5 —ESV
“and have built the high places of Baal to burn their sons in the fire as burnt offerings to Baal, which I did not command or decree, nor did it come into my mind—”