[AlexanderHowl]

That orbit will cause massive instabilities in the orbital mechanics of both planets and, with just a few thousand years, both planets will end up in much different positions, with one likely thrown out and one thrown in. Multiple planets sharing close objects work best in a six-body rosette, where each body occupies the Sun-Objecf L4 of another body and the Sun-Object L5 of yet another body.