Ok so basically, the warden needs some minor improvement, it's supposed to be blind, right? But after it does that "I found you" animation and growls, it can in fact see you (until it catches you), because even if I break a block to make a noise, and I don't move so I'm completely quiet, it'll still chase me like it just magically knows where I am.

To reproduce, make the warden angry by getting near it, then ender pearl away as it roars. The warden will continue to chase you despite the fact that it's blind.