Animations are not stopping when I call AnimationTrack:Stop()

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#1

I made a basic animator script to play a walk animation if a character is walking and an idle animation if they are standing still

local Animator = Instance.new("Animator", script.Parent.Humanoid)
local Anim = Instance.new("Animation")
Anim.AnimationId = "rbxassetid://616158929"
local Idle = Animator:LoadAnimation(Anim)
Anim.AnimationId = "rbxassetid://616168032"
local Walk = Animator:LoadAnimation(Anim)
Anim:Destroy()
local Playing = Idle
script.Parent.Humanoid.Running:Connect(function(Speed)
	local Anim = Speed > 0.0078125 and Walk or Idle
	if Anim ~= Playing then
		Playing:Stop()
		Playing = Anim
		print(Playing == Idle and "Idle" or "Walk")
		Playing:Play()
	end
end)

I very clearly call :Stop() and then call :Play() on a different track but the walking animation never stops even after my print statement prints Idle meaning Idle should be playing

Why does :Stop() seem broken?

#2

Turns out reusing the Animation object was the problem so this behavior stopped when I did this

local Anim = Instance.new("Animation")
Anim.AnimationId = "rbxassetid://616158929"
local Idle = Animator:LoadAnimation(Anim)
Anim:Destroy()
local Anim = Instance.new("Animation")
Anim.AnimationId = "rbxassetid://616168032"
local Walk = Animator:LoadAnimation(Anim)
Anim:Destroy()