Reproduce mujoco parsing problem

reproduce.py

import mujoco
import tempfile

model_urdf_string = """
<?xml version="1.0" encoding="utf-8"?>
<!--Create with rod using build_cartpole_model.py -->
<robot name="cartpole"> 
    <link name="cart"> 
    <inertial> 
        <origin xyz="0.0 0.0 0.0" rpy="0.0 0.0 0.0"/> 
        <mass value="1.0"/> 
        <inertia ixx="0.0035416666666666674" ixy="0.0" ixz="0.0" iyy="0.0010416666666666669" iyz="0.0" izz="0.0041666666666666675"/> 
    </inertial> 
    </link> 
    <link name="pole"> 
        <inertial> 
            <origin xyz="0.0 0.0 0.5" rpy="0.0 0.0 0.0"/> 
            <mass value="0.1"/> 
            <inertia ixx="0.008333958333333334" ixy="0.0" ixz="0.0" iyy="0.008333958333333334" iyz="0.0" izz="1.25e-06"/> 
        </inertial> 
    </link> 
    <joint name="pivot" type="revolute"> 
        <origin xyz="0.0 0.0 0.0" rpy="0.0 0.0 0.0"/> 
        <parent link="cart"/> 
        <child link="pole"/> 
        <axis xyz="1 0 0"/> 
        <limit effort="500.0" velocity="10.0" lower="-3.4028234663852886e+38" upper="3.4028234663852886e+38"/> 
    </joint>
</robot>
"""
    
mj_model_raw = mujoco.MjModel.from_xml_string(model_urdf_string)
path_temp_xml = tempfile.NamedTemporaryFile(mode="w+")
mujoco.mj_saveLastXML(path_temp_xml.name, mj_model_raw)
model_mjcf_string = path_temp_xml.read()
print(model_mjcf_string)
mj_model = mujoco.MjModel.from_xml_string(model_mjcf_string)