### Godot version

v4.1.dev.custom_build.a7276f1ce

### System information

Win10, AMD 2600, GeForce GTX 1060, Vulkan API 1.3.205

### Issue description

I can't get correct color data from an array of source_color type.
The color data is saved as **Color** in the file:
`shader_parameter/palette = [Color (1, 0, 0, 1), Color (0, 1, 0, 1), Color (0, 0, 1, 1)]`
Shouldn't it be saved as PackedColorArray?


### Steps to reproduce

1.Declare an array of source_color type.
2.Set colors.

### Minimal reproduction project

[shadertest.zip](https://github.com/godotengine/godot/files/11246504/shadertest.zip)

materials_for_2d.clear();
	dirty_materials.clear();
	memdelete(shader_names);
	shader_names = nullptr;
}
void BaseMaterial3D::_update_shader() {
	dirty_materials.remove(&element);
	MaterialKey mk = _compute_key();
	if (mk == current_key) {
		return; 
	}
	if (shader_map.has(current_key)) {
		shader_map[current_key].users--;
		if (shader_map[current_key].users == 0) {
			
			RS::get_singleton()->free(shader_map[current_key].shader);
			shader_map.erase(current_key);
		}
	}
	current_key = mk;
	if (shader_map.has(mk)) {