What I am asking is, if I change this property on the server, is it possible that the humanoid movement physics calculations made by clients get replicated to the server, hence making it possible for exploiters to break the effect?
Asking because this is the way I am handling a stun and I do not wish to temporarily Anchor the HumanoidRootPart unless absolutely necessary as that makes the character hang in air and would be a nuisance to fix.
I am pretty sure that it isn’t replicated if changed from client, however is replicated when changed from server.
Humanoid.JumpPower and Humanoid.WalkSpeed don’t have the Not replicated Tag too, yet exploiters can change then and the server doesn’t notice.
It is worth testing, try changing it from the client(Property or Humanoid:ChangeState(Enum.HumanoidStateType.PlatformStanding)) and switch to the server and see if replicated.