Player goes invisible in play solo, but does not go invisible in the test server?

Basically, this script makes the player invisible when the seat is sat on. It checks if someone is sitting on it, gets all their hats and limbs and makes those invisible. It works in play solo, but it does not work in the test server. Why?

local Player = game.Players.LocalPlayer

local Seat = script.Parent

Seat.Changed:connect(function(property)
    if property == "Occupant" then
        for i, v in pairs(game.Players.LocalPlayer.Character:GetChildren()) do
            if v:IsA("BasePart")then
                v.Transparency = 1
            end
            if v:IsA("Hat") then
                local Hat = v:FindFirstChild("Handle")
                Hat.Transparency = 1
            end
        end
    end
end)