I placed a cube in the scene with simulated physics. In the editor, running 2 clients on a dedicated server, the cube falls to the floor. In the standalone server, the cube doesn’t fall. So I think perhaps something is up with simulated physics on the standalone dedicated server. This would also explain why my projectiles work (they’re translating) and my vehicles don’t.
I’m going to try to find out why physics simulations aren’t running on the standalone server.