It works so, that if you start climbing a wall, or just anything that can be climbed, and after that grapple onto anything, then you can jump from air, and then repeat that for as many times as you want, if you collide with the ground, the effect will stop working.
If by any chance devs are reading this, I just want you to know, that I want this to be a feature not a bug, thanks!
#Infinite jumps with grappling bow
deft berry