How can I recover lost progress in Apple Arcade's Dead Cells?

I just lost four months of progress on the Apple Arcade version of Dead Cells. I have two devices: a phone and an iPad. I generally play on the iPad, and when I went to the phone, I was 4 months behind. I figured it would sync up by itself, so I went back to the iPad. However, when I got there, the iPad synced to the phone, and all my progress from the past four months was wiped. This is disappointing. How can we be expected to pay $84 a year when we can’t even keep our progress?

This isn’t a Dead Cells problem. This is an Apple Arcade problem. Apple needs to fix it.

[Re-Titled by Moderator]