Explanation:
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Because reality uses Raytracing instead of Screen-space reflections!
Is this a serious question? If you really want an idea of how it works you should get a laser pointer and point it at the egg in the mirror and then put some fog/dust in the beam. It should be apparent what's happening.
Its an optional illusion. Nothing exists and we are but the stuff of dreams.
It's optional for the people on the other side of the mirror only
I like the Action Lab guy going through the explanation for this https://youtu.be/ezUmSO_OAxY
That's a cool trick. I didn't know about it, but it also didn't surprise me. I did test it to confirm first, though.