Why won't SubtractAsync() CSG Negate?

Hello. This has a really simple fix.

Problem:

• You forgot to parent the union to Workspace.

Solution:

• Parent it to Workspace by using SubtractUnion.Parent = workspace.

Recommendations:

• Use a WeldConstraint since it doesn't require the "C0" and "C1" properties.

• Don't use the second argument of Instance.new(). It's inefficient and causes lag. Instead, set it manually by using weld.Parent = hitboxClone.

Fixed Code:

game.Players.PlayerAdded:Connect(function(player)
    local char = player.Character or player.CharacterAdded:Wait()
    local hitboxClone = game.Workspace.Hitbox:Clone()

    hitboxClone.Parent = char
    hitboxClone.Position = char.HumanoidRootPart.Position
    hitboxClone.Anchored = false
    hitboxClone.Name = "PlayerHitbox"

    local weld = Instance.new("WeldConstraint")
	weld.Part0 = char.HumanoidRootPart
    weld.Part1 = hitboxClone
	weld.Parent = hitboxClone

    hitboxClone.Touched:Connect(function(hit)
        if hit.Name == "Subtract" then
            local SubtractClone = hitboxClone:Clone()
            SubtractClone.Parent = game.Workspace
            SubtractClone.Anchored = false
            SubtractClone.Name = "SubtractHitbox"

            local parts = {hit}
            local SubtractUnion = SubtractClone:SubtractAsync(parts)
            SubtractClone:Destroy()

		SubtractUnion.Parent = workspace
        end
    end)
end)