Have found, on iOS, that when the "generating world" box is open and scrolling through the tips, seemingly not doing anything, the game is actually running. Have had others join my game and play while I am stuck in this state. Unfortunately, since you can't see the game running, you are subject to being killed by mobs easily. It can take anywhere from 5 - 20 minutes before the game actually "loads", though it has been running the whole time.
iOS 14.2 on iPad Pro 12.9 inch - same thing. Stuck on generating world. Have tried uninstall / reinstall, no luck. Reboot usually works most (not all) of the time for one good launch, about 1/20 tries for success otherwise.
Have found, on iOS, that when the "generating world" box is open and scrolling through the tips, seemingly not doing anything, the game is actually running. Have had others join my game and play while I am stuck in this state. Unfortunately, since you can't see the game running, you are subject to being killed by mobs easily. It can take anywhere from 5 - 20 minutes before the game actually "loads", though it has been running the whole time.