Z Fighting

When you dig out below flat ground then place a wall underneath you get z fighting in the corner between the wall and ground.

https://steamuserimages-a.akamaihd.net/ugc/1817763481091136340/92A6DAD91FC2F23BB705F93F35A64C516D900B30/?imw=5000&imh=5000&ima=fit&impolicy=Letterbox&imcolor=%23000000&letterbox=false

Incidentally having a ton of fun with the game! A 3D rimworld is exactly what I've been wanting. Great job!