CI bug only appearing on windows

[BDonnot]

Install branch bd-dev from source

type

python3 -m unittest test_n1contingencyrewards.TestN1ContingencyReward_Base.test_do_nothing

It fails I don't know why and can't really test ATM.

[BDonnot]

It appears to be caused by storage power set to Nan in the "backend action" of the _obs_env but I don't know why