I checked as you suggested, but I don't understand the problem. When I download the game without mods from the App Store, the store works fine. However, the modded game gets stuck on the loading screen. I've tried waiting a long time, enabling tracking permissions, and using a VPN. I've completely uninstalled and reinstalled the modded game, but it still store doesn't work.
By the way, I've had a similar problem before with another game. The modder shared a link to an older, stable version of the mod. I downloaded the old version from there and sideloaded the update from there, which fixed it. Maybe if I could find the old, stable version of this mod, I could try installing it the same way. But I don't know where to find it. 😒