In creative mode, I tried to make a map of my build and the map looked glitched out. In the attached pictures you can see what the world looks like and then you can see what the map looks like.
MC-180393
Map generation is glitched
Resolved
Duplicate
0
Archisman Giri
(Unassigned)
Unconfirmed
(Unassigned)
20w17a
Retrieved
im having this same issue. it seems that blocks placed down after updating to this version will display properly, but updating any map from prior to 20w17a will result in the glitch