So I bet the Voices still have a fear of mirrors. At least most of them, I don't remember Stubborn really expressing much more than wanting to smash it and continue outside of Moment of Clarity.
So in a post-ending world they wouldn't have mirrors. That solves the problem, right? Wrong. Turns out they're afraid of their own reflections for the most part too. If it can act as a mirror, they jump at the sight of themselves.
Every hears shattering glass, goes to see what Contrarian did now (as he is the prime cause of broken windows), but instead find Opportunist with his hand coated in his own blood from punching the window out of shock of just seeing himself.
Hunted grabs a bowl of water (can't do the cat lapping at water thing with a cup because of his beak), notices his reflection in the water and jumps back in pure fear. Dropping the bowl and spilling it everywhere.
They'd probably all eventually work through it after touching the reflective surfaces in question doesn't erase their existence but mirrors are still a bit too far.