I have maps in my world from 1.15 and when I updated the world to the snapshots when I updated the maps they got corrupted as if they were showing through the world.
MC-185972
old maps that are updated to 1.16 snapshot are not outdated correctly
Resolved
Duplicate
0
Worlds opened in 20w17a are broken and need to be repaired, see MC-179858 for details.