Today I was killing my 8th wither. When I killed it, I noticed that I didn't see a star drop. I searched for about 5 minutes, and stopped after that since it would have went away by then. Now, knowing that Wither's have a 100% chance to drop the star, and there's no way I wouldn't have found the star if one was dropped, I came to the conclusion that it's explosions that it shot out before it died, had destroyed the star it dropped. This is very discouraging. I spent at least one whole hour farming in my nether fortress to get the skulls to be able to spawn the Wither, and all for literally nothing. By now, this has turned into a nagging rant, so I'll leave it at that. The goal of this was to see if this had happened to anyone else, and make Mojang aware that such a thing is even possible.
Oh yeah, that really can happen, it's because the skulls it shoots explodes and sometimes one can go off as the Wither is dying. And if you try to kill it with TNT too, but that's a whole different story.
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"Sometimes, I just wanna give up, say 'I'm done with this mess' and go to bed. But you know what; you can't shrug off your responsibilities. You got to pull yourself up and meet the challenges head on. That's the only way you're gonna get ahead in life."
You should put this on the bug tracker.