[Bug Report] Pause button for IsaacSim GUI pauses rendering but not the simulation

[nblauch]

If you are submitting a bug report, please fill in the following details and use the tag [bug].

Describe the bug

When you pause the simulation in the GUI, the main rendered content pauses, but visualization markers keep moving (and the simulation keeps running, as seen in the terminal).

Steps to reproduce

Please try to provide a minimal example to reproduce the bug. Error messages and stack traces are also helpful.

To reproduce, run any isaac lab task in a --viz kit setting, then try to pause it in the gui.
e.g.
./isaaclab.sh -p scripts/reinforcement_learning/rsl_rl/train.py --task=Isaac-Velocity-Rough-Anymal-C-v0 --viz kit

Paste your error here

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System Info

Describe the characteristic of your environment:

• Commit: [e.g. 8f3b9ca]
• Isaac Sim Version: [e.g. 5.0, this can be obtained by cat ${ISAACSIM_PATH}/VERSION]
• OS: [e.g. Ubuntu 22.04]
• GPU: [e.g. RTX 5090]
• CUDA: [e.g. 12.8]
• GPU Driver: [e.g. 553.05, this can be seen by using nvidia-smi command.]

Additional context

Add any other context about the problem here.

Checklist

• I have checked that there is no similar issue in the repo (required)
• I have checked that the issue is not in running Isaac Sim itself and is related to the repo

Acceptance Criteria

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• Criteria 1
• Criteria 2