There is no sniffer, and the potion that makes you a sniffer crashes the game when used.

The Sniffer mob has been removed from the game, spawn eggs don't work and the Bottle of Sniffer crashes the game with the exit code "java.lang.NullPointerException: Ticking player"

 

This is for "23w13a_or_b" not "23w13a", but there is no option for it. I am fully aware this snapshot is a joke, I just thought it was funny.