[MC-183701] Maps are generating with some missing blocks

When I refreshed my maps they become like this screenshot, with a line pattern of missing blocks. The blocks are not missing in the physical world however.

Related issues

duplicates

MC-179858 Maps show stone-like pattern despite it not being there

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migrated 2020-05-13T02:25:53Z

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Arisa Bot 2020-05-13T02:26:00Z

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violine1101 2020-05-13T11:38:44Z

Worlds opened in 20w17a are broken and need to be repaired manually, see MC-179858 for details.