Insufficient size for copy state or keyframe for flex objects

[v-r-a]

Intro

Hi!

I am a graduate student using MuJoCo for my research.

My setup

MuJoCo 3.7.0 (checked for 3.3.7 too)
C or Python
Windows or Linux

My question

Unable to copy state for flex objects once the simulation starts.

Steps to reproduce:

1. Load the trampoline.xml from model/flex in the simulate window
2. Pause and reset. Copy state and paste it in XML file. One gets a keyframe as expected.
3. Let the simulation run for a short time. Pause and copy state again. Try pasting it in XML. Unable to get the full state.

I need a starting point for a simulation with a robot (instead of a sphere) that has fallen on a soft object.

Issue #2166 seems to be solved. Not sure if this is a bug or a pending enhancement.

Minimal model and/or code that explain my question

No response

Confirmations

• I searched the latest documentation thoroughly before posting.
• I searched previous Issues and Discussions, I am certain this has not been raised before.