Minor graphical bug. When the wave effect is applied after Link has dissappeared behind the screen from a cave walk down/up animation, he reappears.
Easy to confirm, but if you want a test quest, use this one.
http://rapidshare.com/files/75723595/BugTest2.qst.html
I produced this bug when the warp types in the screens with four caves were set to wave effect warp type, but the screen two below the upper left corner of the second and third DMaps have caves that use wave effect warps.
Windows build 679, Z3 Movement Disabled.