OK, I didn't test it thoroughly before finding the other "orbits" bugs and didn't know it was the intended behavior.
It's indeed an opinion, but the current behavior seems strange, especially when a planet is under the horizon (non visible), but still in the viewport, with its orbit displayed, then the orbit suddenly disappears (because it goes unnoticed out of the viewport) and one doesn't understand why.
OK, I didn't test it thoroughly before finding the other "orbits" bugs and didn't know it was the intended behavior.
It's indeed an opinion, but the current behavior seems strange, especially when a planet is under the horizon (non visible), but still in the viewport, with its orbit displayed, then the orbit suddenly disappears (because it goes unnoticed out of the viewport) and one doesn't understand why.
But I can live with it :-)