I have died and lost so much inventory every time the voxel world breaks and sends me to Rising Worlds version of Hell. As other games I have played, how about giving us a break and spawning us on the surface after we quit and returned if we have left the world's confines?
Falling through world
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if you fall you can hit the f2 key to pop you back to the top, you just need to be fast and you may need to hit it more than once,