The warp tile in the water room in Labyrinth of Dinus, Garden of Evil level can not be accessed and has become solid. It is supposed to take you to the Water Works level. See the following video:
[video=youtube;CkqtqPWMFxg]http://www.youtube.com/watch?v=CkqtqPWMFxg[/video]
It worked properly in Zelda Classic 2.10.
Quest is at http://zeldaclassic.com/viewquest.php?q=273