I finally got around to testing certain FW possibilities me and jbop have been looking at. These consist of oddities where the game loads the room differently from when you left it, sometimes even the wrong room entirely.
This works with :
Void warps with FW set anywhere in shadow (all FW points load the maze room)
Certain Boss Rooms (pics below)
It's pretty cool to see these rooms without cheats or entrance editor. I don't know exactly why certain ones do and don't work. ***I'm sure mzx or someone probably knows in specific, I guess certain things probably are set to be first to load (which would make sense).
http://i.imgur.com/3bMTEBT.png forest
http://i.imgur.com/IEds9mJ.png fire
http://i.imgur.com/sXohHa9.png shadow
http://i.imgur.com/rCRG1Nd.png spirit
deku dc jabu just load as far as i can tell unchanged versions of the room before the boss door
water doesn't seem to do this at all from what I can tell
*****edit: after talking with mzx, this is the theory
-respawns after voids contain map and coordinate data
-maps loaded were map 0 for preboss rooms and were coinciding with the map 0 of gerudo's fortress that was void warped from.
-water boss room loaded map 1 because the void warp section tested was not map 0 but map 1 or higher
-there are also multiple types (3 or 4? ) of voids that all are setup differently and affect void warp