As the title says, this is a visual bug that keeps changing all terrain textures a short distance in front of me.
Here are 2 videos showing this happening
https://streamable.com/yayo9
https://streamable.com/ai4dv
Here is also a picture that shows how annoying it can be. It may look like 2 hills with 2 different colors (grey in the back and brown at the front) but it's actually 1 hill that changes color half way through because of this bug.
https://imgur.com/a/DHlZ3Oj