I started a new world and all the stuff that is shown with icons on the map (for example plants) was already revealed. The background of the map that shows the biome wasn't revealed and walking around didn't reveal it. Saving and reloading doesn't fix it and it seems to always occur when creating anew world now. I made a new world a few days ago where this didn't occur. I would add a screenshot but I'm sorta in a hurry right now if you need a screenshot tell me and I'll add it later. I don't have any mods installed and didn't mess with the files in any way.
1.)Start a new world 2.)The map is broken (is this only happening to me?)