The issue is with your shader in blender. The default shader for Sprytile does not import nicely into Godot. I suggest you make an actual Godot Shader. Even when I just used a principle bsdf shader in blender, it still doesn't import everything correctly into Godot. By creating my own custom Godot shader, I avoid that issue. When you import the gltf file into Godot 4.0 you can go to the materials section in import and override the material with your Godot material. If you are using some other engine, the advice remains the same, just create a material within that engine.