Unable to Produce Results When Moving scene.get("obj").position Again

[Jhih2501]

Dear Sionna developers,

I am attempting to use the Position-based Time Evolution for loop structure in Mobility within Sionna RT to compute ray tracing at different time steps. While the initial object position is set correctly and works as expected, the program gets stuck when I try to update the position of the objects for the second iteration.

Below is a snippet of the code for reference:

It gets stuck at line 11 and throws the following error in Jupyter:

Here are some of the software versions:
Python: 3.8.20
Sionna: 0.19.1
TensorFlow: 2.13.0
TensorFlow-GPU: 2.10.0
CUDA: 12.6

Here are the hardware specifications:
CPU: i5-12400
GPU: GeForce RTX 3080 10GB
RAM: 32GB

Supplement: The scene contains only two types of objects. The first is a wall with the material set to the official itu_concrete, and the second is a cylinder with a custom material. Below is the result of the first ray tracing execution after importing the scene into Sionna.