Shader on Subviewport working on Editor but not in game

Help Shaders
,
1

Godot Version

4.3.2

Question

I have an icon that is rendered from a Subviewport into a 3D Mesh with a Shader. When viewing it through the editor and the subviewport view, the shader works as intended:

image
image200×726 34.9 KB

However, when running the scene, the model is only rendered from its first frame (when the shader is white), and stays at this point.
image

I’ve tried setting the Render Update Mode to Always, and it didn’t work as well. Changing shader parameters in code also don’t result in any change to the icon model.

Am I doing something wrong?