I can't edit the default mannequin...?

I’ve been trying to edit the default mannequin to make it a T pose instead of A pose (for retargeting with a makehuman mesh) but it keeps resetting after closing the edit window (yes, I click save). I’ve also tried making a duplicate but that also resets. Am I doing something wrong here?

If you clicked save pose it should be saved in the new pose, to view the saved pose select “view pose” and it should snap back to the edited pose that you saved. Even though it isn’t staying the saved pose for normal viewing that is the pose that will be used for retargeting (the saved pose).