Transferred to new phone, but PvZ data didn't transfer

So I upgraded to a new phone today. The iPhone 18 Pro. Plants vs. Zombies 2 managed to start back up with no problem, with everything carried over. However, the save data from the first Plants vs. Zombies game didn't carry over. It ended up starting from the very beginning. I can't seem to find the option to back up the save data, and can't find it in the settings either.

I have limited time with the old phone, and I really need help to see if it's possible to bring the save progress over to the new phone before it's too late. I may have to permanently lose the save progress, due to a fatal flaw. I need someone who can help me through every step of the way.