SubtractAsync is somehow nil (pls help)

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I’m making a katana tool that slices things in half, but it has a fatal error.

Explanation on how it slices things

It’s fairly simple, just clones a model in replicated storage with two giant negative parts, clones the part that’s going to be sliced, then the left negative part slices the original part, and the right negative part slices the cloned part.

It works flawlessly the first time I cut a part, but after that I get this error:
Players.xXRed_VoidXx.Backpack.Katana.Cut:37: attempt to index nil with ‘Parent’
This is the line that sets the left slice into the workspace.

Another absolutely mind boggling thing is that I can slice as many parts, but I cant cut a part more than once. And yes, it can slice any union.

A short summary(ish):
After cutting a part, the slices are just fine.
After cutting the slices, the unions(slices) are nil, and somehow don’t exist

The code: (the reason so much is commented is because I’m trying to experiment and narrow the problem down)

local touch = true
script.Parent.Blade.Touched:Connect(function(part1)
	if touch == true then
		touch = false
		part1.Anchored = true
		local par = part1.Parent
		--part1:Destroy()
		part1.CanTouch = false
		part1.Transparency = 0.9
		print(par)
		local slice = game.ReplicatedStorage.Slice:Clone()
		slice:PivotTo(part1.CFrame)
		slice.Parent = workspace.Slices
		wait(1)
		--local double = part1:Clone()
		--double.CFrame = part1.CFrame
		--double.Parent = part1.Parent
		local leP = {part1, slice.Left}
		--print(part1)
		--print(slice.Left)
		--local riP = {double, slice.Right}
		local left = part1:SubtractAsync(leP,Enum.CollisionFidelity.PreciseConvexDecomposition)
		--left.Name = "WallLeft"
		--print(left)
		--local right = double:SubtractAsync(riP,Enum.CollisionFidelity.PreciseConvexDecomposition)
		--workspace.Slices:ClearAllChildren()
		--double:Destroy()	
		--left.Anchored = false
		--right.Anchored = false
		--left.Velocity = part1.Velocity
		--right.Velocity = part1.Velocity

		--left:Remove()
		--print(left.Parent)
		print(left)
		wait(1)
		left.Parent = par
		left.Transparency = 0
		--right.Parent = workspace
		wait(1)
		touch = true
	end
end)

The problem is the left.Parent.
Somehow I even got an error just printing left.

Sorry, it’s a little hard to explain on a crappy computer that doesn’t have obs.

Also, a question, why does subtractAsync delete the OTHER half of the part???
I literally deleted the right block, and the LEFT block deletes the half of the part that ISNT IN THE NEGATIVE BLOCK.

edit: I just learned that a part that has been cut NOT by the katana, still gets the error if I cut it with the katana. Maybe I can’t SubtractAsync a part more than once?

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