When cloning a player's character, a LocalScript breaks for some reason

Help and Feedback Scripting Support
1

So, I have a ViewportFrame. I use a custom function, creating a clone of your character, then put it inside of the ViewportFrame.

The Cloning Character Script (LocalScript)

local function getFakeCharacter()
      
      character.Archivable = true
      local fake = character:Clone()
      character.Archivable = false
      
      return fake
end

local fakeChar = getFakeCharacter()
local newCam = Instance.new("Camera", workspace)

--blah blah blah (parenting fakeChar to Viewport and point newCam towards player, then setting Viewport.CurrentCamera to newCam)

After doing this, my custom sprint script inside of the original character breaks for some reason. (uses ContextActionService to make your WalkSpeed faster)

The Sprint Script (LocalScript)

local function sprint(_, inputState)
	
	if inputState == Enum.UserInputState.Begin then
		
		isSprinting = true
		humanoid.WalkSpeed = 30
		
	elseif inputState == Enum.UserInputState.End then
		
		isSprinting = false
		humanoid.WalkSpeed = game:GetService("StarterPlayer").CharacterWalkSpeed
		
	end
	
end

Why this happens, I don’t know why. Any pointers would help.

2

Are there any errors being passed in the output tab?

3

Nothing is shown on the Output after cloning and destroying the fake character.