Have found a problem with vehicle despawning when host player leaves. I notice this happen on my main server so setup a new test server to verify problem, setup and problem below.
Test Server run the latest server version, client up to date, scripts running (baseevents, chat, fivem, hardcap, mapmanager, rconlog, sessionmanager, spawnmanager and simple vehicle spawn script).
Server start no error reported, player 1 joins server becoming the host player, players 2 and 3 join server. All player spawn a vehicle, player 1 leaves server all spawned vehicle get removed, all local AI peds neither player despawn, all AI vehicles despawn.
Test server running on window 10 with all requirements