Before going to 1.16 I have a huge map wall in my world. Now in 1.16 when I make a new map it appears to have corrupted the surface of my world visually and comparing it to already made ones, there is a huge difference.
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Please follow the instructions in the moderator note on MC-179858, and in the future, please use the search engine to prevent duplicates, and also be more vigilant when using very early developer builds of the game.
Did you open your world in any snapshots?