I'm playing in Singleplayer 20w17a and when creating a map, everything in the map looks around destroyed/covered in grey marks when it's not. I've noticed that this is happening everywhere I create a new map. I don't have any shaders/resource packs on either.
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I have the same problem. In my survival world.

Yeah. It seems to be a visual glitch because when you look at the map in an older version(I tested it on 20w16a) It shows correctly. It is not the maps generation It is a visual glitch.