Revert "Do not load chunks when calling world.getChunk"

For some reason, some maps do not load properly when this patch is applied. Don't know why, but clearly it changes behavior in strange ways.

This reverts commits 2499e7f8eec3e354f6cc20b613d2a93c34679927 and c7102b5baaae8c2359f9aec8ef1acc16d034a9ce.