[MC-133995] Transferring world from 1.12.2 to 1.13 isn't working

Trying to load world from 1.12.2 in 1.13 results generating new world with the same seed but from scratch, without any buildings I've made before. Optimizing world from single player tab isn't working too. World download: https://drive.google.com/open?id=147m1Quq7iXTYcvKZHkOpITNu17nf5CX2

Environment

Win 10, Java 8 Update 51
CPU: i3-2120, GPU: GTX 650
8GB RAM, 1GB allocated to Minecraft, default jvm arguments

Linked issues

is duplicated by 1

MC-134136 1.12.2 world resets in 1.13 Resolved

Attachments

latest.log

Comments 6

kumasasa 2018-07-19T20:48:52Z

Structure data may be corrupt

Was it only ever loaded/saved in vanilla?
What version was the world started at?

migrated 2018-07-20T00:16:07Z

Only vanilla, yes. 1.12.2
edit: this world is playable prior to pre-7

likalaruku 2018-07-29T22:42:05Z

Having the exact same problem with a vanilla-only 1.12.2 world.

migrated 2018-07-30T10:43:17Z

Fixed in 18w30b

kumasasa 2018-07-30T23:30:10Z

No, fixed in 18w30a.

migrated 2018-07-31T00:16:17Z

Partly. World is playable in 18w30a but optimizing isn't working, it's just seems to stuck at random chunk everytime, at least for me. In 18w30b all is ok