Maps are not working as they do normally in the latest snapshots. When one is created, they have a very buggy look. There are streaks going through the maps showing the under ground or some cave systems. Can't figure out what causes it, I just know that it is with every map I make or was previously made.
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Worlds opened in 20w17a are broken and need to be repaired manually, see MC-179858 for more details.