I am trying to code a spatial shader, which takes the color values from the pixels of a (uniform) texture and sets the y coordinates of the vertices of a plane mesh accordingly. The texture is a ViewportTexture. In the editor it works, but as soon as i start to run my project the debugger says "ViewportTexture: Path to node is invalid" and my plane stays flat. However assigning a ViewportTexture of the same Viewport to a TextureFrame works fine. Can anyone tell me what is going on?