When you spawn there won't load blocks, its just the sun and moon, blue above and black underneath you. You can't move or else, you're just stuck in your place. Even when you optimise your world it wouldn't load the world well!
MC-138430
Spawnbug
Resolved
Duplicate
0
Niels Schut
(Unassigned)
Unconfirmed
Minecraft 18w43b, Minecraft 18w43c
Retrieved
Thank you for your report!
However, this issue is a Duplicate of MC-138114.
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