Fairly unusual to get a black hole illusion when flying a visual approach in extremely bright sunshine which is what caused the PAPIs to be invisible..
Just to be clear, what do you do when you break out at 200 feet from an ILS and see three reds or three whites? Keep the stable approach going or fanny about with pitch and power to get 2 reds and 2 whites? PAPIs becoming observable late on a visual approach is the same. Do you divert if they are unservicable?