Netcode bug (more like my skill issue)

Questions & Answers
1

When I launch a client the host loses control of his airplane and both host and client are assigned to the same airplane, none o them can control anything, I also used if(!isOwner) return, I have used network behaviour, collisions are perfect, I can see the other player and the camera is a child of the player prefab, what could be wrong?

2

I dont know about the controls without seeing more of your script but I had the same problem with clients and hosts being assigned to the same objects - had to put a check on the camera script for my cams and cinemachines, like so

    using UnityEngine;
    using Unity.Netcode;
    using Cinemachine;
    public class CameraOwnerChecker : NetworkBehaviour
    {
        [SerializeField]
        private Camera viewCam;
        [SerializeField]
        private CinemachineVirtualCamera cinamachineCam;
    
        private void Awake()
        {
            viewCam = GetComponent<Camera>();
            viewCam.enabled = false;
            cinamachineCam.enabled = false;
        }
    
        private void Start()
        {
            if (IsLocalPlayer)
            {
                // Debug.Log("Camera is local player. Setting true.");
                viewCam.enabled = true;
                cinamachineCam.enabled = true;
            }
            else
            {
                // Debug.Log("Camera is not local player. Setting false.");
                viewCam.enabled = false;
                cinamachineCam.enabled = false;
            }
        }
    }

hope it helps!