Region3 Table not storing / registering correctly?

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1

I’m working on a renderer that uses Region3 to determine the radius & then load parts required.
Now, it works correctly up until the final part - When attempting to remove from the table, it fails to do so and in turn when it comes to rendering it again - it simply does not.

Does anyone have any suggestions?

VisualUtil.Render = function(Exterior, World)
	local BasePosition = Exterior.PrimaryPart.Position
	local Min = BasePosition - Vector3.new(750, 750, 750)
	local Max = BasePosition + Vector3.new(750, 750, 750)

	local Region = Region3.new(Min, Max)
	local PartsInRegion = workspace:FindPartsInRegion3(Region, nil, math.huge)
	
	for __,Part in pairs (PartsInRegion) do
		if Part:IsDescendantOf(Exterior.PrimaryPart.Parent.Parent) or Part:IsDescendantOf(Player.Character) or Part:IsDescendantOf(Camera) then else
			if PartInRender[Part] then
			else
				PartInRender[Part] = Part:Clone()
				PartInRender[Part].Parent = World
			end
		end
	end
	
	for __,Part in pairs (PartInRender) do
		if (Part.Position - Exterior.PrimaryPart.Position).Magnitude > 1000 then
			Part:Destroy()
			PartInRender[Part] = nil
		end
	end
end