If you die and press "R" at the exact same moment it respawns you with no body and it doesn't let you move :)

https://medal.tv/games/discover/clips/1500sMaAUPg2vt/d1337yojZl7b?invite=cr-MSxk...
Actually, I accidentally still somehow did the ghost respawn glitch, the reason I disappear after becoming a ghost is because I was pressing R for my speed run attempts and did it out of habit.
https://medal.tv/games/discover/clips/1502qsWlkecPYy/d1337xbUdu6O?invite=cr-MSw4...
Here I accidentally did it again and I finished it to prove that it's broken enough to get fast times.