### 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)

Material *material = material_owner.get_or_null(p_material);
	ERR_FAIL_COND_V(!material, false);
	if (material->shader && material->shader->data) {
		if (material->shader->data->is_animated()) {
			return true;
		} else if (material->next_pass.is_valid()) {
			return material_is_animated(material->next_pass);
		}
	}
	return false; 
}
bool MaterialStorage::material_casts_shadows(RID p_material) {
	Material *material = material_owner.get_or_null(p_material);
	ERR_FAIL_COND_V(!material, true);
	if (material->shader && material->shader->data) {
		if (material->shader->data->casts_shadows()) {
			return true;
		} else if (material->next_pass.is_valid()) {
			return material_casts_shadows(material->next_pass);
		}
	}
	return true; 
}
void MaterialStorage::material_get_instance_shader_parameters(RID p_material, List<InstanceShaderParam> *r_parameters) {