When shifting with a head on (any) the head will stay as if standing but the player will be crouching and the player's head outside of the head.
I expected it to move with my head.
(I was trying to dance with MHF_Chest's head on)
It just stayed where it was though.
1. Press F5 (so you can see)
2. Put on a head.
3. Press shift.
I was only trying to dance in F5 mode haha