How many times do I have to say this? It’s clear in the actual film Palpatine changes his mind and turns back to Rey because Kylo Ren redeemed himself. His plan was to possess Kylo Ren, that is until he redeemed himself.
To be clear, I’m fairly certain this is the approach Hal is going with. So no need to clarify this again.
EDIT: We are doing a slight deviation from this, though. In this edit, Palpatine always wanted Rey dead until Ben redeems himself. So he never “turns back” to Rey, he only realizes she can serve his purposes now.