A problem with lauching old type of world

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Steps to Reproduce:
1.
2.
3.

Observed Results:
(Briefly describe what happens)

Expected Results:
(Briefly describe what should happen)

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We're tracking this issue in MCPE-120820, so this ticket is being resolved and linked as a duplicate.

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Steps

1. Make new map with old world type(not the infinite or the flat one)

2. Observe Minecraft keeps building terrain all the time and never goes next

Results

1. maps with old world type won't open

2. weird spawnpositions and limitedworldorigins

Expected one

1. normal little tiny minecraft old type world