Overgrown and P1 Exits mute voice lines
Regardless of which character or set of voice lines is selected, Overgrown chambers do not play any voice under the "Exit" category when reaching the exit.
I do not know exactly why this happens, but I think it has something to do with the music still being played. In other chambers, music stops at some point while the Exit voice is playing, like in Old Aperture, the moment you step on the catwalk the music stops. Maybe there's some trigger missing in the Overgrown exit corridors?
Same goes to every exit door except Vertical Door variant in P1
Same goes to every exit door except Vertical Door variant in P1
Any open exit works, while the round doors don't. You can get around this by placing your own door in front of the the actual open exit, which looks a bit awkward and is a hassle to set up.