they've been doing that for 6 years at least (see end of this video, I uploaded in 2011)
That is not what I meant, I know that happens, but what I mean is like strobe light flashing. It is very bright and flashes quickly before exploding if you get too close to it. I had to log off immediately after because it hurt my head and eyes and because I am prone to seizures and it would suck if there was no fix for this because then I'd have to stop playing until this issue is fixed.
The wiki mentions the flashing, but doesn't say when it was added in MC Java. It was added to Pocket Edition in 0.12.1 (Sept 2015.) Not sure if it started in Java and went to PE, or the other way around.
I was playing on 1.12 and with the default texture packs and no mods and now the creepers flash before exploding?? My friend even noticed that they flash before exploding. Is that a part of a new update?\
Edit: The flashing is strobe light like and very bright. It flashes white and only does when you get too close before it explodes. I'm not talking about the normal flashing it does, but of a strobe light fashion.