Using BABYLON.DefaultRenderingPipeline with depthOfField creates strange effects on GUI (partly blurred).
Example: https://www.babylonjs-playground.com/#USTXX4
EDIT:
BABYLON.DynamicTexture https://www.babylonjs-playground.com/#USTXX4#2 The workaround I`m going with.

No real solution except having a plane right behind the plane.
BABYLON.DynamicTexture https://www.babylonjs-playground.com/#USTXX4#2 The workaround I`m going with.