Not sure if it's the same issue, as it looks like there are a few different iOS versions here, but I resolved this in iOS 13.2 by using the "offload" feature, which retains all the data but removes the app. Then after reinstalling it worked and all the worlds and packs were still intact.
Not sure if it's the same issue, as it looks like there are a few different iOS versions here, but I resolved this in iOS 13.2 by using the "offload" feature, which retains all the data but removes the app. Then after reinstalling it worked and all the worlds and packs were still intact.