installation of kidzik/opensim package using python3.7+

[AxelWimmer]

I'd like to use opensim-rl together with stable-baselines3, however this requires python3.7+.
The installation command given in the readme works only with python3.6:
When executing

conda create -n opensim-rl -c kidzik -c conda-forge opensim python=3.7
conda activate opensim-rl
conda list

I get the warning
_WARNING conda.core.prefix_data:load_single_record(188): Ignoring malformed prefix record at: /home/wimmer/anaconda3/envs/opensim-rl/conda-meta/opensim-4.0.0-py36_15.json
and opensim does not appear in the list of installed package
Is there some easy way to fix this problem?
I'm using conda version 23.1.0 and Ubuntu 22.04.2 LTS