Results 1 issues of Valentin Macé

### Context: I am running my implemention of the PGA-MAP-Elites ([see paper](https://hal.archives-ouvertes.fr/hal-03135723v2/file/PGA_MAP_Elites_GECCO.pdf)) in brax halfcheetah. I obtained good and consistent results with the old `v0.0.10` physics in `halfcheetah` (and in...