I’m not seeing that setting on my iPad. I saw the same problem on 13 before I updated to iOS 14. Reinstalling didn’t work. I don’t have access to any of my purchases.
I have the same problem on WiFi (I don’t have a mobile plan for this device). iPad Air 2, iPadOS 13.6.1, Minecraft v1.16.50
I’m not seeing that setting on my iPad. I saw the same problem on 13 before I updated to iOS 14. Reinstalling didn’t work. I don’t have access to any of my purchases.