Objects not being added to FilterDescendantsInstances for raycast blacklist filter

I have a model of a turret that casts a ray to detect if it can shoot the player. To prevent the ray from being blocked by the turret itself, I loop through the turret and its descendants, and add the parts to the raycastParam blacklist array. Despite this, the output in console shows that parts are blocking the ray; nothing is printed as being inside the blacklist as well:

> Ray found player
> Ray blocked by Tip (x7)
> Ray found player (x21)
local function rayReachedPlayer(player)
	--[[ Checks if a ray casted from the turret to the passed player is blocked by an object. Returns true if blocked, false if clear path. ]]
	local torso = player:FindFirstChild("HumanoidRootPart")	
	local raycastParams = RaycastParams.new()
	for i,v in pairs(turret:GetDescendants() ) do
		if v:IsA("BasePart") or v:IsA("Part") then
			-- add all parts in turret to blacklist
			table.insert(raycastParams.FilterDescendantsInstances, v)
	for i=1, #raycastParams.FilterDescendantsInstances do
		print(raycastParams.FilterDescendantsInstances[i].Name .. "is in the blacklist!!!!!")
	raycastParams.FilterType = Enum.RaycastFilterType.Blacklist
	local rayDirection = (torso.Position - turretBase.Position).Unit * aggroDistance -- strange equation

	local raycastResult = workspace:Raycast(turretBase.Position, rayDirection, raycastParams)

	if raycastResult then
		local hitPart = raycastResult.Instance
		local reachedPlayer = false

		-- check if hit part is part of player		
		for i,v in pairs(player:GetDescendants()) do
			if hitPart == v then 
				reachedPlayer = true

		if reachedPlayer then
			print("Ray found player")
			return true -- nothing blocking! ray has found player
			print("Ray blocked by " .. hitPart.Name)
			return false -- something is in the way.
		print("Ray failed to cast. raycastResult does not exist!")

Try raycastParams.FilterDescendantsInstances = { turret } no need to loop. The property takes an array of instances. Each instance and it’s descendants are ignored.