It's more likely than not bleaching though VERY rarely you'll see it as a mutation. Note that a bleached tip isn't gonna go green(aka repair itself), so all you can hope for is to stop more tops from bleaching.
The one and only "albino" mutation I've personally witnessed was in a reveged plant in its 2nd trip to flower under a "blurple" type light. It was a dwarf and there was no way it was bleaching, plants 3x its size were fine.