Yup, very likely to be that if you ask me. Because you created in blender, the path and the meshes are automagically converted from the right handed system to the BJS default. But the camera isn’t. Else, if you don’t want to use the right handed system for your entire scene, I guess the easiest would be to simply invert your path in blender. Or, as per your attempt above, you could create a camera with inverted axis (providing you select for the correct type of camera).
Thank you very much, For the moment it solves my problem although I still don’t know what other implications there are for the rest of the scene. I had been exploring with the rotation quaternion, but hadn’t seen anything mentioned about the useRightHandedSystem function.