Hey all, I am not a part of the Hollow Knight speedrun community but was playing tonight and discovered something I thought may be of use. Maybe it's already been found, or not been found useful, but here goes.
I'm in my first playthrough, exploring Greenpath. I was about to fight my ghost from a previous death, with my knight positioned just to the right of a screen transition. I didn't time my hit right, and the ghost hit me into the screen transition. When the transition was over, I had been shot across the map out of bounds, to approximately where the red x is in my screenshot. Unfortunately, this was a soft lock, as my character was running around just below the screen. Unfortunately I didn't capture this, and don't know if it's repeatable. Upon reloading at the Lake of Unn, the area I was apparently slingshot across was now discovered on my map (area between ghost icon and red x).
If this is of no use or discovered already please disregard.
Thanks :-)