Problem with mouse

I have a placeable bush tool that I made this morning, but when I move the mouse around, the preview object keeps flashing.
I made it so the preview wouldn’t display if it was touching an anchored part, but would display if it was touching an unanchored part.

https://gyazo.com/4b3229ca0b3257f583b409044a6542df

What is causing this?
I also received a client error during a playtest that said “Attempt to index nil with ‘Anchored’”. I think it’s from the script checking if Mouse.Target is unanchored.

Here is the code:

local P = game:GetService("Players")
local plr = P.LocalPlayer
local Mouse = plr:GetMouse()
local rs = game:GetService("RunService")
local RS = game.ReplicatedStorage
local uis = game:GetService("UserInputService")

local tool = script.Parent
local event = tool:WaitForChild("RemoteEvent")

local equipped = false
local connection = nil
local inputConnection = nil

local preview = nil

local rotateIncrement = 10
local maxBushes = 5
local bushesPlaced = 0

tool.Equipped:Connect(function()
	equipped = true
	preview = RS.BushCamoAddon:Clone()
	preview.Anchored = true
	preview.Parent = workspace
	
	Mouse.TargetFilter = preview
	
	connection = rs.RenderStepped:Connect(function()
		if equipped == true and preview ~= nil and Mouse.Target.Anchored == false then
			preview.Transparency = 0.1
			preview.Position = Mouse.Hit.p
		else
			preview.Transparency = 1
		end
	end)
	
	inputConnection = uis.InputBegan:Connect(function(key,gpe)
		if not gpe then
			if key.KeyCode == Enum.KeyCode.R then
				preview.CFrame = preview.CFrame * CFrame.Angles(0,math.rad(rotateIncrement),0)
			elseif key.KeyCode == Enum.KeyCode.T then
				preview.CFrame = preview.CFrame * CFrame.Angles(0,0,math.rad(rotateIncrement))
			elseif key.KeyCode == Enum.KeyCode.L then
				event:FireServer("Reset")
				bushesPlaced = 0
			end
		end
	end)
end)

tool.Unequipped:Connect(function()
	equipped = false
	preview:Destroy()
	preview = nil
	Mouse.TargetFilter = nil
	connection:Disconnect()
	inputConnection:Disconnect()
end)

tool.Activated:Connect(function()
	if Mouse.Target.Anchored == false  and (bushesPlaced < maxBushes) then
		event:FireServer("Place", preview.CFrame, Mouse.Target)
		bushesPlaced = bushesPlaced + 1
	end
end)