I actually have seen this in vanilla servers, though clients had Lambda and the Simple Trainer installed, not sure if that is a problem. The pattern I am focused on is when the server decides a new arbitrator by votes who happens to have poor ping (usually by living far away from the server’s hosted location).
Another issue (Similar but different) I am trying to look into if anyone has already solved is when in a server with vsync if NPCs, Vehicles, and such start bugging out, meaning they freeze frame every few seconds, then teleport to where they should be a second or two later, then repeat.
I think it is some sort of syncing issue, I am testing by adding and pulling scripts one at a time, because this issue is either due to the newest FiveM update (Doubt it) or vsync, essential mode (and es_admin resource), or possible one of the other recent server resources.
For this issue with players freezing in front of doors, the only fix I ever found was deleting the vehicle (With such a script) then respawning it, sometimes each player needs to toggle ragdoll just to sync themselves too (Cause or else they slenderman around) before entering a vehicle, but even then it isn’t a 100% solution.