BrickColor problem with for loops how do i fix this transparency wierd thing?

--Ok so I wrote up this script:

Part = script.Parent

while true do
	for i = 0,1,0.1 do
		Part.Transparency = i
		wait(0.01)
	end
	for i = 1,0,-0.1 do
		Part.Transparency = i
		wait(0.01)
	end
	Part.BrickColor = BrickColor.Random()
end

--But it changes when its fully un-transparent, not when it's done with the 2nd for-loop. I know i can just change the brickcolor line to after the 1st for-loop and it would work, but can anyone tell me why it wont change after the 2nd for-loop and changes after the 1st? ( why does it change when its visible and not invisible) Thanks any help would be appreciated

Part = script.Parent

while true do
    for i = 0,1,0.1 do
        Part.Transparency = i
        wait(0.01)
    end
    Part.BrickColor = BrickColor.Random() --the for loops have to finish before the brick color change happen
    for i = 1,0,-0.1 do
        Part.Transparency = i
        wait(0.01)
    end
    Part.BrickColor = BrickColor.Random()
end