Can't pickle carb._carb.Framework objects

I am trying to use Isaac Sim/Gym with the Ray/RLlib/Tune framework.

The latest requires some pickling of the environment and this raises an error Exception has occurred: TypeError can't pickle carb._carb.Framework objects. The environment I am playing with is a simple Cartpole from this tutorial here

Has anyone found a work around for this problem ?

Even a simple pickle.dumps raises an exception.