This glitch is discovered by GlitchesandStuff! Not me. I just uploaded this video when I found it myself too.
When you can stand on that log or switch in unloaded room, game loads up that room normally and all things works correctly. Idk why it works like this and does this have any use somewhere else. I just needed to upload video of this thing to make sure people know about this trick.
This trick useless because it skips only one room and with other wrong warp spot you can skip this room completely! And you cannot even perform this glitch when water level is low. You can swim in water but you can't get on to log and this prevents you to loading room at all.