The slide property is not rendered in Unity.

### Intro

hello. I am working on the mujoco project with Unity. This time, I used a slide in the model, but it came out normally in the simulator, but it was not created properly in Unity, so I would like to inquire.

### My setup

3.2.0
Unity 2022.3.4f1

### What's happening? What did you expect?


As shown in the image, the slider is rendered normally in the simulator, but is not rendered in Unity.

### Steps for reproduction

The model was imported using import mujoco scene using the Unity plugin.

### Minimal model for reproduction

I couldn't reveal all the information about the model, so I only wrote some of it.

...

### Code required for reproduction

```python
import mujoco
import mediapy as media
model = mujoco.MjModel.from_xml_string(xml)
data = mujoco.MjData(model)

with mujoco.Renderer(model) as renderer:
mujoco.mj_forward(model, data)
renderer.update_scene(data)

media.show_image(renderer.render())
```

### Confirmations

- [X] I searched the [latest documentation](https://mujoco.readthedocs.io/en/latest/overview.html) thoroughly before posting.
- [X] I searched previous [Issues](https://github.com/google-deepmind/mujoco/issues) and [Discussions](https://github.com/google-deepmind/mujoco/discussions), I am certain this has not been raised before.