Why Does this only sometimes fire? ContextActionService?

This checks to see if a light button is in the vicinity and turns on the lights incorporated to that button. For some reason it only sometimes fires and sends the signal to the server even though all of the requirements are met. Help!

local script in backpack:

wait(1)
local interactables = game.Workspace.MapParts:WaitForChild("Interactables")
local player = game.Players.LocalPlayer
local contextAction = game:GetService("ContextActionService")

local SelectedLight = nil
local active = false

local range = 4.6

function InteractionS(name, inputState, inputObject)
    if SelectedLight ~= nil then
 game.ReplicatedStorage.LightEvent:InvokeServer(SelectedLight)
 script.LightS:Play()
end
end

function FindClosestLights()
 if not player.Character or not player.Character:FindFirstChild("Humanoid")then
  return
 end
 local Region = Region3.new(
  player.Character.Torso.Position-Vector3.new(range,range,range),
  player.Character.Torso.Position+Vector3.new(range,range,range)
)
 local CloseObjects = game.Workspace:FindPartsInRegion3(Region)
 local Lights = nil
 for _,x in next,CloseObjects do
  if x.Parent == interactables.Switches then
   Lights = x
  end
 end
 return Lights
end

function AntiCrash(name, inputState, inputObject)
 if inputState ~= Enum.UserInputState.Begin or not SelectedLight then return end
 spawn(InteractionS)
end


while wait() do
interactables = game.Workspace.MapParts:WaitForChild("Interactables")
 SelectedLight = FindClosestLights()
 if SelectedLight ~= nil and not active then
  active = true
  contextAction:BindActionToInputTypes("Interaction",AntiCrash,true,"e")
  contextAction:SetTitle("Interaction","Light ON/OFF")
 elseif active then
  active = false
  contextAction:UnbindAction("Interaction")
 end
end

Script in workspace works fine and without the AntiCrash the script crashes the game.